Bug at starting and for backing up patches


Hi Brad,

Sorry for my unperfect english.

Thanks, I received my Parva yesterday and I used it all the night so much I’m delighted with these great sounds !

But there is a curious bug who did appears the first time I powered the machine and once again this morning. the interface seems to work but It sounds like a car who can’t start. Heavy noise. I had to start it many times before that works again.

I also have a problem for backing up patches. I used ParvaUtil0.5 for to do it, it seems to work but any patch I sent into the machine work. All settings of patches I resend to the machine have fancyful settings and there is no sound or only noise. I’m running whith Windows10 and the connexion works only on the USB2 and when I disable the antivirus.

The firmware is already 0.62 but anyway, I could try an update? I hope that I could get back my patches.


I can confirm that the patch backup doesn’t work for me either (ParvaUtil 0.5). Dumping Sysex to PC (W10) goes fine but loading them back to Parva results in silent/noisy patches. Luckily I tried it with only one patch. Also the positioning of patches to specific banks/slots with ParvaUtil doesn’t seem to work.


Edit: I see the problem, and will put out an updated patch utility later today.


here is a patch I maked. But it’s the same when I try to load patches I
found on topics (factory patch and dkparvadesing).

And it make two time again the same bug like at the begining: a big noise
during one minute. So in all three time when I turned on the parva, and one
time during the editing of a patch. Do you think that will be fixed if I
make an update?

B00 Toptruction.syx (453 Bytes)


I edited the patch you uploaded. Does it work when you send it to the Parva?
B00 Toptruction (edited).syx (455 Bytes)

I’m not sure about the “big noise” – is this a random noise when you’re not playing, or does it only happen when a key is pressed?


I’ve put together a little utility to repair patches that have gotten out of alignment due to various firmware and ParvaUtil changes.

  • To use it, load a patch file using the button or drag and drop the file on the web page.
  • You may then change the name, bank, and slot.
  • The tool will display a few key parameters to help you determine what needs to be adjusted.
  • Use the buttons to shift the patch data, or just reset OSC* Range (useful for older patches).
  • Once you’re done, click “Save Patch”, and the file will be saved to your browser’s download folder.

Parva Patch Fixer



the utility works fine, but not with patches in multimode. At the moment that is not a problem for me.

About the bug at starting, I will send you a mail with an audio extract.



About the bug at starting: You can hear an extract in attachment.

It appears when I turn on the Parva
After a few time, about one minute, that stop if I decrease cutoff to zero
(it’s the same whith all 5 different type), or all osc level to zero.
After that, more time passes and more I can increase cutoff and levels
without noise.
Cutoff, osc levels and any others settings don’t modify the noise, just
makes it start or stop. Only main level realy act on it.
When it appears, all seems to work fine by making abstration of this big
It’s the same with each of eight output, and main output.
I have the impression that it took longer than yesterday.
After that, I can turn off and on the power, that will appears only after
it’s off during more than five minute.

I’m not a specialist, but for me that looks like a defective condenser,
maybe somewere in the main board (because it’s the same for all output). If
you think like me, could you send me an another mainboard?

noise at starting.mp3 (529 KB)


It certainly does sound like something related to the power supply, possibly a capacitor. I’ll email you with some options for replacement/repair.


Ok great, I wait your next email.


It turns out I have the same problem too! @futuresonus suggested that I should start it up with an init patch. The bug still happens. I also wonder if this bug is affecting the VCF resonance