US3833750A

US3833750A - Reed accordion with programmable electronic organ sound

Info

Publication number: US3833750A
Application number: US00328531A
Authority: US
Inventors: A Iorio
Original assignee: SYN CORDION MUSICAL INST CORP
Current assignee: SYN CORDION MUSICAL INST CORP
Priority date: 1973-02-01
Filing date: 1973-02-01
Publication date: 1974-09-03
Anticipated expiration: 1991-09-03

Abstract

A reed accordion has a set of note generators each coupled to a respective key and is connected through a plurality of tone filters to an output. Each filter corresponds to a respective organ voice and is controlled by a respective tab which disconnects its filter from a bus (otherwise common to all filters) when actuated and thereby renders it operative. A plurality of registration program cards removably received in multicontact sockets on the instrument each carry a registration program network which is connectable through a respective registration switch to selected filters such that actuation of this switch will automatically cut in selected filters by disconnecting them from the bus. Each card bears two registrations in the form of conductors printed on its two faces so that simple scratching-through of a conductor programs that network for the respective organ voice, allowing the user to establish his own organ-voicing programs. A further switch, in one position, permits the accordion treble shifts to operate without preprogrammed organ-voicing and, in another position, provides programmed organ voicing for each treble shift.

Description

I United States Patent 1 1111 3,833,750

Iorio 1 Sept. 3, 1974 REED ACCORDION WITH Primary ExaminerJoseph W. Hartary PROGRAMMABLE ELECTRONIC ORGAN Assistant Ex min r- W l n SOUND Attorney, Agent, or FirmKarl F. Ross; Herbert [75]' Inventor: Amedeo Iorio, Long Island City, Dubno [57] ABSTRACT [73] Asslgneei SYN Cordlon Muslca! Instruments A reed accordion has a set of note generators each Corp" Long Island coupled to a respective key and is connected through 22 Filed; Feb 1, 1973 a plurality of tone filters to an output. Each filter corresponds to a respective organ voice and is controlled [21] Appl' 328,531 by a respective tab which disconnects its filter from a bus (otherwise common to all filters) when actuated [52 us. c1...'. 84/1.01, 84/103, 84/1.17 and thereby renders it operative A plurality of regis- [51] Int. Cl. G10h 1/00 "ation Program cards removably received in multi- [58] Field of Search 84/ 1.01, 1.03, 1.17, 376, Contact Sockets 011 the instrument each Carry a regis- 84/343 345 1 19 G 15 mg 7 tration program network which is connectable through a respective registration switch to selected filters such 5 References Cited that actuation of this switch will automatically cut in UNITED STATES PATENTS selected filters by disconnecting them from the bus.

, Each card bears two registrations in the form of congg z zlgi ductors printed on its two faces so that simple scratch- 3084584 4/1963 [Om n :ZII' X ing-through of a conductor programs that network for 3I151I203 9 1964 Brand 84/1.19 the respective Organ Voice allcwing the user to estab- 3,172,939 3/1965 Campbell et al.. 84/1.01 x lish his Own Organ-voicing P g A further Switch, 3,213,179 10/1965 Clauson 84/].03 in one position, permits the accordion treble shifts to 3,250,168 5/1966 Sepp 84/ 1.03 X operate without preprogrammed organ-voicing and, in 3,375,320 3/ 968 Carras 84/376 X another position, provides programmed organ voicing 3,422,718 1/1969 Noehren 84/103 x for each treble hift 3,646,241 2/1972 Ott 89/].03

Sustain 8 Claims, 4 Drawing Figures sass mc. 2e ;D J E TREBLE mc.

zu run 7 Q" NOTE "2B1 yum/11m 25 PER.

mt: FILTERS Dd, BM. 2 2/3 Cal. Plu. 16' Sus.

8' Sustain Cal. Flu. Kin. 4' S'trstuin 22/3 Percussion Organ PATENTEUSEP 3.833.750

SHEET 10F 3 PAIENTED 31974 3.833.750

' sum aor 3 FROM fi yt u A l 32 T0 PROGRAM CARDS [G 2 SWITCH -1;

21 FIG. 3

REED ACCORDION WITH PROGRAMMABLE ELECTRONIC ORGAN SOUND FIELD OF THE INVENTION The present invention relates to an accordion-organ combination. More specifically, this invention concerns an accordion provided with stops and electronic circuitry so that it can produce music from electronically generated notes and tones in addition to reedgenerated music.

BACKGROUND OF THE INVENTION In my earlier US. Pat. Nos. 3,052,147 and 3,084,584, issued on Sept. 4, 1962 and Apr. 9, 1963, respectively, I described an accordion incorporating electronic tone generators and stop-controlled filters which allowed it to be used also as an electronic organ (i.e. an accordion-organ combination). The reeds of the accordion could be used in conjunction with the electronic circuitry or alone, or the electronically generated tones alone could be used by shutting off the reeds.

Such an instrument has high versatility in that it allows an accordion player to produce various types of music which has not been possible heretofore, since certain types of music do not generally lend themselves to the standard reed-accordian sound. Now the artist may complement this sound with numerous effects with sustains, repeats and percussive effects available so that he can play virtually any of the many different types of music currently in vogue on a single instrument. In addition, should it be desired, the accordion sound can be cut out altogether and accordion techniques righthand treble and left-hand .bass can be used to play the instrument like an electronic organ.

When an instrument so equipped is used, it is often a considerable bother to set up a new registration or reprogram it for each different song. Since or more stops and another dozen variable controls may be desirable for a very large number of registrations, the difficulties in programming the device for the registration desired in the next number are considerable. This complexity has made it altogether impossible to change registrations to any useful extend in the middle of a piece or even in a single performance program. For example, a reed accordion having eight treble shifts and a priorart set of organ stops required a number of these organ stops to be set for any selected treble shift when combination sound was desired. This was not only inconvenient but it was also insufficient if special effects were desired.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide an improved accordion-organ combination instrument of theabove-described general type while avoiding the disadvantages of earlier systems.

Another object is the provision of an improved electronic musical instrument having a simplified system for programming it with different registration.

SUMMARY OF THE INVENTION These objects are attained according to the present invention in an electronic accordion or musical instrument having a plurality of accordion-key-operated note generators each serving to generate a particular musical note and a plurality of tone filters connected to these generators for imparting various tonal qualities to the generated notes known as voicing the notes. Each such filter is normally rendered inoperative by connection to a bus, and for each voice a stop is provided which operates a normally closed switch to disconnect the desired filter from the bus and thereby enable it or make it operative. In addition, according to my present invention, aprogram network is provided which is connectable between some of the filters and the bus to render only certain filters inoperative, thereby effecting a particular registration.

According to another feature of this invention, a program switch is provided on the accordion keyboard and is connected between the first-mentioned normally closed switch of each filter and the program network to disconnect this normally closed switch from the bus and connect it to the program network. This program switch is thrown to convert the accordion from conventional use, whereby the desired stops are individually actuated, to programmed use whereby the desired registration is effected by cutting in selected filters automatically. When a plurality of such program networks are provided, each is in turn associated with a respective program stop actuatable to cut in a respective organ registration, and a general PROGRAM ON-OFF switch is provided. The player then may switch in any desired registration by first depressing the PROGRAM- ON TAB, preferably located in the row of treble accordion tabs, and then depressing the tab for the desired program.

With such an arrangement it is possible for the most used registrations of the various organ stops to be stored in the unit and switched in at will. For instance, a common BASSOON registration is 16 FLUTE, 8 CLARINET, 2 DOLCE and 2 PERCUSSION along with one reed. This combination therefore requires the actuation of four different stops which is a good deal less than many registrations which can require eight or more different individual voices. According to this invention, a number, eight for instance, of such programs can be held in the instrument, each associated with an accordion treble tab which operates the appropriate conventional shifters for the accordion reeds.

.In accordance with another feature of this invention the program networks are constituted by conductors printed on cards (printed-circuit boards) which can be plugged into appropriate sockets of the accordion. Such cards, according to the present invention, can be provided on both faces with networks of conductor paths which, when plugged into a socket that is connected through the PROGRAM ON-OFF switch to the respective filters, completes the necessary circuits to give the desired registration. A feature of the system of the present invention is the simplicity of the program card which need not carry any circuit elements other than an array of parallel, selectively interruptable conductors.

Another feature of this invention is a method of programming the various voice combinations on the program cards. This method consists of breaking the conductor paths which correspond to the individual voices that are to be effective for the desired registration. In the case of a printed circuit card, the conductors are broken by merely scratching through the conductor with a penknife or the like.

This provision of such programmable cards allows the user himself to make up cards for whatever registrations he uses most often so as to save him the bother of depressing all of the necessary tabs each time such a registration is called for. In addition, he can change from oneof his own, personally programmed, registrations to another with the mere flip of a tab. Should he ever feel like changing one of his programmed registrations to include an extra voice, he need merely pull out the appropriate card and scratch through the appropriate conductor on the face of the card for the voice he wished to add. Removing a voice from a program requires a new card to be prepared but, since such cards are small and very inexpensive, this is no hardship. An experienced performer can, in addition, carry a plurality of extra cards in his shirt pocket, when on the job, to allow him to change from one set of programs to another between numbers, and, as a matter of fact, he can rapidly change in the middle of a number from one program to another, something that was never possible with prior-art devices.

According to another feature of the invention each tone filter is rendered inoperative by connection to a bus through a normally closed switch connected to the stop for the particular voice produced by that filter,

FIG. 3 is a schematic diagram of the circuit elements shown in the dot-dash box indicated at III in FIG. 2; and

FIG. 4 is a perspective view of a program card showing how the program is established.

SPECIFIC DESCRIPTION is connectedvia output cable 5 to a swell pedal 7 in and through the PROGRAM ON-OFF switch men tioned above. In this manner, even when the accordion is'used with a program, a stop can be depressed to add yet another voice to this program, the series connection of the switches allowing this.

The individual program tabs, according to the invention, simultaneously function at least as the treble shifts of the reed accordion. As is conventional, each treble shift may operate a mechanical slider for controlling air passages of the accordion and, as I have described in an earlier patent mentioned above, the row of treble shifts may include a tab which operates a shutter for the treble part of the accordion. In addition, the programming tab, connected only to the electronic organ circuitry,

may be operated to enable the electrical circuitry of the treble tabs/program tabs. Thus, in one position of the switch operated by the programmingmode tab, the treble tabs are effective only to operate as shifters for the mechanical sliders of the reed organ, the switches controlled by the treble tabs being ineffective. In the other position, the treble tab switches are rendered effective to provide the proper organ registration or tonal effects coinciding with the accordion treble tab depressed. All of the filter, tone generator and electronic switch circuitry and all other circuit elements (apart from the final output amplifier and the manually controlled switches on the accordion keyboards) may be provided on a single removable and readily accessible circuit board mounted behind the accordion console carrying the individual organ stops and the accordion treble shifter tabs.

' DESCRIPTION OF THE DRAWING turn connected to an amplifier-speaker 6.

As described in my above-mentioned patents, the reed organ has for the treble and

base keyboards

2 and 3 sets of reeds for each note, three reeds for each treble key and five for each bass button. The bass keyboard 3 has a set of 6 tabs or shifts 8 which open and close the various sets of reeds in a manner well known in the art. Similarly, the treble side is provided with a set of tabs 9 which open and close the sets of shifters or shutters for the reeds of the treble part of the instrument. These tabs or stops 8 and 9 are provided with circles subdivided into regions corresponding to the various sets of reed. A dot is provided in those regions where the shutters for the reeds are open. The linkages and structures connecting the tabs 8 and 9 with the various sets of reeds are described at length in my abovementioned patents.

The treble stops or shifter tabs, commonly including BASSOON, CLARINET, PICCOLO, MASTER, MELODION, OBOE, ORGAN and CLOSE, are preferably mounted on a single support which, in turn, can be fastened to the accordion treble console above the treble keyboard. The tabs lie in a row terminating in a PROGRAM ON tab, as described below, which controls the program mode (organ program or absence of organ program). The latter tab controls no shifters and in either of its positions is capable of affecting the treble shifters or stops of the accordion when it is operated exclusively as a reed instrument. The treble-tab assembly, each treble tab of which is provided with switches for the organ registration in addition to the shifters for the reed quality of the accordion, is provided with a plug-and jack connection to a matrix board having at least one diode matrix, as will be appar ent hereinafter.

As also described in my US. Pat. No. 3,084,584, the instrument comprises a set of 12 basic oscilators which are each coupled with five or six frequency dividers to emit, overall, different notes which are combined and voicedto provide all of the various organ effects.

The treble keyboard 2 comprises 41 keys 10 which each are connected with that element of each set of the three reed sets corresponding to a particular note, as also described in my patent cited immediately above. In addition, each key 10 operates a respective sixpole double throw (GPDT) switch 11, three of which are shown in the drawing. The notes are subdividedinto three groups corresponding to keys 10 for low range, 10 for mid range, and 10 for high range.

The switches 11, are all identical. Switch 11 has six poles 11 which normally lie against contacts a lc' '-4lc' a ld 41d 9 12' Q and 1! 41! ground.

Each pole 1 1 is connected to a respective sustain gate 12 of a bank 12 of such gates. These gates are also connected to the note generators discussed above. The bank 12 of sustain gates has three

outputs

13, 14 and 15, corresponding to 16', 8, and 4 voices. Each gate is also connected to a respective part of a note generator.

The poles 11 are all connected together to a common bus 16 which is connected in turn to various circuit elements of the organ part of the instrument. Since the contacts 11 are all connected to ground, actuation of any of the keys will connect the various circuit elements to ground and thereby allow them to function, whereas no key is actuated much of the organ circuitry is disconnected from ground to disable it and thereby reduce power consumption when no key is actuated.

The other four poles of each switch are connected to the various oscillators and frequency dividers as shown. It is understood that the production of organ tones re quires the combination of various different notes with different tonal qualities, along with simultaneous suppression or generation of harmonics, depending on the tone desired. The contacts 11, are all connected together to a bus 17 to feed to this bus a signal representing note which is offset from the note associare connected to .ated with the respective key 10 as shown. The remaining contacts 11 are connected, according to range, to a plurality of tone filters 18 The filters 18 18 and 18 are connected to the contacts 11 11 and 11 respectively, as well as to respective prefilters 18 18 and 18 in turn connected to respective prefilters l8, 4 18 and 18 These prefilters are connected to the switches of the other two ranges in the same manner as the filters 18 18 and 18

Filters

18 and 18 are connected via line 18 to contacts 11 and filters 18 are connected via respective lines 18 to the filters 18 18 18 and 18 respectively.

Connected to each filter 18 is a respective voice switch 19 controlledby a respective one of tabs 20 shown in FIG. 1. Actually some 36 tabs are shown in FIG. 1, as well as eight rotary controls, in addition to the nine tabs 9 controlling the reeds and the programs as will be described below. These fifteen extra tabs control various repeat, vibrato, and similar effects having little to do with the present invention.

Each switch 19 is normally closed so that it connects the respective filter 18 to a bus 21. This connection disables the respective filter so that if, for instance, a 8' Trumpet voice is desired, the switch 19 is actuated to uncouple the filter 18 from the bus 21 and render it operative. When operative, each filter feeds the appropriately voiced note through a line 22 to an output amplifier 23.- The percussion filters 18 are,

however connected via their own line 24 to a percussion preamplifier 25 and'thence to the amplifier 23.

This preamplifier 25 is connected to the enabling bus 16 so that it is only operative when a key is depressed.

A bass'microphone 26 and a treble microphone 27 are provided adjacent the respective sets of bass and treble reeds of the instrument and are connectable through

respective switches

28 and 29 operated by

tabs

30 and 31, on the accordion key board or console, to the amplifier 23 so as to allow electronic amplification of the normal reed-accordion sound itself.

According to my present invention, each voice switch 19 can be connected by means of a PRO- GRAM ON-OFF switch 32 comprising respective SPDT switches either directly to the bus 21 or thereto through the intermediary of various program networks 33 In the PROGRAM ON position of switch 32 these networks 33 are connected between the switches 19,. and the bus 21, whereas in the PROGRAM OFF position they are connected directly to the bus 21.

Each program or register network comprises a respective two-faced nonconductive card 34-37 whose one faces 34a-37a are shown. These cards are printed on both faces with respective arrays of conductors; four such cards are shown at 38-41. Each array consists of 22 parallel conductors connected together at one end of the respective board and all terminating at the other edge of the board which is adapted to be received in one of several multicontact sockets shown schematically at 42-45. The first 21 contacts in each socket, corresponding to conductors 38'-4l are connected to respective isolating diode matrices 46 which are in turn connected to respective filters 18 when switch 32 is thrown to the right, as seen in FIG. 2. The twenty second conductors 38-4l" of each card are connected through a respective normally open program switch 47 to the bus 21. Thus, assuming all of the conductors on each card to be intact, if the program switch 32 is thrown into the PROGRAM ON position the filters 18 will all be disconnected from the bus 21 and, when any of the switches 47 is closed, all of the filters 18 will be connected through the respective one of the arrays 38-41 to the bus 21. I

The device is programmed, however, by interrupting one or more of the conductors of each array so that only selected ones of the filters are connected to the bus when one of the switches 47,.,, is closed. The network 33, is shown set up for a Bassoon regulation with the first only of the three sets of treble reeds and whereby the conductors are cut corresponding to the following filters: 16 Flute, 8 Clarinet, 2% Dolce, and 2% Percussion, thereby forming one predetermined registration program. On a device having four cards with a registration program on each face, the following seven other programs can be provided:

REED CONDITION (SHIFTER POSITION) TREBLE TAB PROGRAM NOTATION (REGISTRATION) I6' CLARINET 8' TRUMPET 4' SUSTAIN PIANO CLARINET second reed open l6' FLUTE 2'38- SHARP 8' SUSTAIN PIANO third reed open PICCOLO all reeds open MASTER MELODION I6' FLUTE 8- FLUTE 4' FLUTE first and second reeds open l6 FLUTE 4'- FLUTE 4'- PERCUSSION OBOE second and third -Continued TREBLE TAB PROGRAM 7 REED CONDITION NOTATION (REGISTRATION) (SHIFTER POSITION) l6' SUSTAIN PIANO reeds open 4'- SUSTAIN KINURA l6' FLUTE 8' FLUTE ORGAN 4' FLUTE first and third 2'% SHARP reeds open 8'- SUSTAIN PIANO 7 l6 FLUTE CLOSED 8- FLUTE no reeds open 2 PERCUSSION Of course if the accordion bellows are not actuated none of the reeds will sound with any of the above pro grams.

These preprepared programs and registration can be supplemented by the accordion user by any possible combination of voices. Thus the buyer can take a virgin card, as shown at 48 in FIG. 4 and by means of a simple instrument, such as the penknife 49, can scrape away the conductors corresponding to the voices he wishes to use in a particular custom program registration.

Since these cards are quite inexpensive, merely being phenolic cards with a simple copper circuit printed on each face in an entirely conventional fashion, the user can set up as many different programs as he desires. The cards then, programmed on each face, are fitted into four slots 50 (FIG. 1) in the instrument so that the user can readily switch from one program to another.

I-Ie can jump back and forth between eight different programs for the next one, with program switching achieved by merely depressing the respective program table.

Of course the program cards described above can be eliminated in a less sophisticated version of the accordion-organ instrument according to the invention. In this case, the diodes 46 46 46 etc. can be mounted on a printed circuit board having sockets or terminals for receiving all of the diodes, one side of each socket or set of terminals being connected to a common bus and switch 47 47 47 etc. as already described. The diode matrix on its board may be readily replaceable in the instrument and can be connected with the remaining circuitry by plug-and-jack means of the multicontact type. The program or registration in this instance is obtained by simply snipping selected diodes from the matrix (in the same pattern as the selected conductors were interrupted in the manner already described.) Just as the program cardsadapted to be plugged into the slots of the treble console are supplied with the entire array of conductors intact for personal registration programming or with predetermined programs, the diode-matrix boards may be supplied with all diodes intact for personal programming or with selected diodes removed for predetermined registrations.

FIG. 3 shows by way of example the filters 18

18p

18 and 18 along with the details of the various switches illustrated schematically in FIG. 2.

Each .of the filters .18 18 and 18," shown in FIG. 3 comprises a plurality of resistors R connected in series with the input line and a capacitor C connected to the output line. In addition secondary resistors R and capacitors C are connected from the junctions between the resistors R and ground. The filter 18 comprises a capacitor C connected to ground and to another resistor connected to the output lead 22. The various resistors and capacitors of these filters have values determined according to principles well known in the art so as to impart the proper tone timbre or overtone quality to the notes fed to them.

The output of the

filters

18 and 18 are connected through

respective poles

19 and 19 to the emitters of a respective NPN transistor Q and 0 These transistors are connected in the so-called inverted mode so that they offer either a very high impedance between their collecter and emitter or a very low impedance. This latter state is achieved by connecting the base of the transistor through a

respective switch pole

19 or 19 to the bus 21 which is positive. Rendering the bases of the transistors Q, and Q positive virtually causes a perfect short circuit from their emitters to ground, which renders the

filters

19 and 19 connected thereto completely inoperative by grounding their outputs. Thus these filters are made operative by ungrounding them, which is achieved in normal operation simply by disconnecting the base of the respective switch transistor from the positive bus with

pole

19 or 19 or by disconnecting the filter from the transistors emitter, both functions being carried out by the two-

pole switches

19 and 19 Of course each filter 18 has a respective voiceswitching transistor connected like transistors Q and Q2 Although shown for the sake of illustration in FIG. 2 as comprising a plurality of SPDT switches, the PRO- GRAM OFF-ON or mode switch 32 actually is a number of ganged DPDT switches combined with 2l switching transistors connected in parallel to the switching transistors discussed above, only the first two, Q," and Q being shown here. The base of thetransistor O is connected to the first one of the conductors 38'-4l through the respective isolating diode 46 and the base of the second transistor O is connected to the second conductor 38'4l, and so on for all 21 transistors and conductors. The switch 32 in the PROGRAM OFF position has one pole 32 connecting the poles corresponding to pole 19 of all of the switches 19 to the bus 21 and another pole 32" which does nothing. On switching to the PROGRAM ON position the pole 32" cuts the supply of current to the bases of the voice-switching transistors corresponding to transistors 0 and Q and the pole 32" connects all of the switches 47 to the bus 21.

In this PROGRAM ON position of the DPDT switch 32 closing of any of the switches 47 will connect one of the respective conductors 38"4l"' to this bus 21 and will thereby connect all of the bases. of all of the transistors corresponding to transistorsQ and Q to the. bus 21, except where conductors on the cards are broken. Thus is the Bassoon switch 47 is thrown, the transistor Q" will not be connected to the bus 21 so that the filter 18 will be rendered operative, while. the transistor Q will be connected through the card 34 to the bus 21 and will short out and render inoperative its filter 18 with'filters 18 18 and 18 being similarly rendered operative.

Obviously if none of the switches 47,; is closed while I switch 32 is in the PROGRAM ON position (to the right in FIGS. 2 and 3) actuation of any of the keys 10 will give a full organ sound, with all voices.'Actuation of any of the keys with switch 32 in the PRO- GRAM OFF position and none of the voice tabs actuated will give only the noted reed accordion effect on the treble keyboard.

If a program is being used it is also possible to add a voice or more to the program by actuation of one of the switches 19 This switch will have to be reversed to eliminate its voice from the accordion sound, however, when the program is cut out.

I claim:

1. In a reed accordion having a plurality of electronic note generators and a plurality of electronic tone filters connected thereto for imparting respective voices to notes from said generators, each filter being connectable through a respective voice switch to a bus such that operation of a switch enables the respective indi vidual filter, the improvement comprising:

a program network including a diode matrix having one side connected to said filters;

a program switch connected in circuit between said filters and said network and operable for simultaneously rendering a selected plurality of said filters operative; and

a multicontact socket connected between said matrix and said bus and a card carrying an array of selectively interruptable conductors receivable in said socket.

2. The improvement defined in claim 1 wherein said card is a printed-circuit board.

3. The improvement defined in claim 2 wherein said accordion is provided with a plurality of said networks, matrices, and program switches.

4. The improvement defined in claim 3 wherein said printed-circuit board has two faces each provided with a respective array of parallel conductors.

5. An electronic musical instrument comprising:

a plurality of note generators each having a respective key operable to generate a respective musical note;

an output circuit connected to said generators;

a plurality of filter means between said generators and said output circuit for imparting different respective tonal qualities to the generated notes;

a bus connected to one side of a power source and selectively connectable to said filter means to render same inoperative, the filter means being operative when disconnected from said bus;

respective control means each including a normally closed switch between a respective filter means and said bus for rendering the respective filter means inoperative by connection to said bus and for enabling the respective filter means by disconnection from said bus;

at least one program network including a diode matrix between selected filter means and said bus; and

a multicontact socket connected between said diode matrix and said bus and a card carrying an array of selectively interruptible conductors receivable in said socket.

6. The instrument defined in claim 5 wherein said diode matrix in said network has one side connected to the filters of said filter means and another side connected to said multi contact socket, said means in circuit with said network including a switch connected between said multi contact socket and said bus.

7. The instrument defined in claim 6 wherein said instrument comprises a plurality of such matrices, program networks, and means in circuit with said program networks, each network being connected to a different group of selected filters.

8. The instrument defined in claim 6, further comprising a reed-type accordion having a treble console and keyboard, a row of treble tabs on said console actuatable for establishing respective reed-accordion voices and provided with respective electrical contacts in circuit with said control means for producing organ tones corresponding to respective registrations, said means in circuit with said program network including a switch tab on said console along said row.

Claims

1. In a reed accordion having a plurality of electronic note generators and a plurality of electronic tone filters connected thereto for imparting respective voices to notes from said generators, each filter being connectable through a respective voice switch to a bus such that operation of a switch enables the respective individual filter, the improvement comprising: a program network including a diode matrix having one side connected to said filters; a program switch connected in circuit between said filters and said network and operable for simultaneously rendering a selected plurality of said filters operative; and a multicontact socket connected between said matrix and said bus and a card carrying an array of selectively interruptable conductors receivable in said socket.

5. An electronic musical instrument comprising: a plurality of note generators each having a respective key operable to generate a respective musical note; an output circuit connected to said generators; a plurality of filter means between said generators and said output circuit for imparting different respective tonal qualities to the generated notes; a bus connected to one side of a power source and selectively connectable to said filter means to render same inoperative, the filter means being operative when disconnected from said bus; respective control means each including a normally closed switch between a respective filter means and said bus for rendering the respective filter means inoperative by connection to said bus and for enabling the respective filter means by disconnection from said bus; at least one program network including a diode matrix between selected filter means and said bus; and a multicontact socket connected between said diode matrix and said bus and a card carrying an array of selectively interruptible conductors receivable in said socket.