[sdiy] DX7s failed recovery after dead battery

[Mattsson Per]

Maybe you should try a factory reset?

http://faq.yamaha.com/us/en/article/musical-instruments/keyboards/synthesizers/dx7s/723/2354/Factory_Reset_Procedure



Skickat från min iPhone

19 mars 2017 kl. 10:27 skrev Rutger Vlek <rutgervlek at gmail.com<mailto:rutgervlek at gmail.com>>:

Dear all,

I'm hoping for a little inspiration and/or expertise from someone here, as I ran into a strange problem with a Yamaha DX7s (yes the S version).

It displayed a dead battery sign, and I've replaced the battery with a fresh one. The message is gone, and it boots correctly. Of course the original memory content was scrambled due to the lack of battery power, so I tried uploading new patches via Sysex. I've tried many different ways of doing this, and the synth receives them, stores them to memory, and I hear differences in the sounds that I can recall. However, all patches suffer from the same problem. A huge amount of vibrato is added, and pitch scaling over the keyboard is often out of tune or randomized. I tried manually programming a patch (in the memory buffer, didn't try storing it yet), and this worked fine. I tried modifying the loaded patches and found strange parameter values for some modulation indeces that caused the vibrato and key scaling to be off. I found values of 15 where my slide and buttons only allow me to enter up to values of 12! Clearly, something goes wrong in receiving the SysEx and putting it !
to memory, but I can't figure out what.

I tried 3 different programs, from a plain SysEx dumper to a more fancy DX editor/librarian. I tried from both Windows and Mac machines. I tried through 2 different midi interfaces (both MOTU). I tried various sources on the internet for the SysEx files, at least 5 different sources. So I'm beginning to think it's an internal problem, and nothing to do with the Sysex itself.

Other MIDI messages are received correctly (e.g. note on/off, controllers, etc).

Any ideas?

Best,

Rutger
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