DX7: no sound for one key - proposals?


Got a DX7 at a flea market - 30€ including four memory cardridges full of sounds was a price worth a gamble for me.
Works well so far (also nice sounds on the cardridges!) - with the excepion that one key doesn’t produce any sound at all. Already removed the key, looked at the contacts and tried to clean them with alcohol. Didn’t help. On first sight the contacts look like all others - nothing bent. The key also looks good, found no visible difference.
Any ideas what I could still try?
It is Eb3, so one of the more central keys…

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Congrats!! nice find! ohh and its always great to have physical “stuff” to interact with.

Im sure you know about Dexed more so as a librarian for your “new-sonic-friend”
Im curious about the Cartridges… but I think 99% of created sounds for DX7 are online somewhere;-)

I never had problems with my DX7, but reading a bit online, keybed is notorious for some issues (the plates tend to bend?.. and don’t make contact/play)

Does Eb3 sound from sending it MIDI? probably yes…

I recall doing this…after some “house keeping” https://www.youtube.com/watch?v=NEiI95IRIXI

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Thanks for the links! Just listened to the “default presets” that a DX7 usually has - for mine all internal presets were completely replaced. So either someone who liked to look up interesting sounds - or an avid sound designer him/herself. Some of the presets sound nice! Two of the cardridges were commercial, Yamaha provided ones, two “RAMs” full of own (or recreated?) stuff.

Thanks for the Dexed link! Will have a look and see how I can get the presets into and from the machine to the computer.

Yes, the sound engine can produce Eb3, if I e.g. transpose the keyboard I can play it at another position.

Cool setup with the Eigenharps and effects! :slight_smile:
Adding a little of some nice reverb sounds like a good idea, indeed…

Also found this: That seems to add multitimbral support (e.g. to play it VpC-style) and full MIDI resolution - tempting, but twice as expensive as my entire synth… :stuck_out_tongue: https://www.ebay.com/itm/E-Grey-Matter-compatible-Extension-Card-for-DX7/163543985450?hash=item2613fb2d2a:g:DPAAAOSwSYdbyId3:rk:1:pf:1&frcectupt=true

Got some additional repair hints on kvr, will look what I can do…

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I had the Grey Matter board. It does not make it multitimbral.

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ah, ok. They meant that in the posting I found the link in. Thanks for the clarification!