[sdiy] Yamaha P50-m inner reverb effect low level issue..

Jean-Pierre Desrochers jpdesroc at oricom.ca
Mon May 29 18:05:12 CEST 2023

Thanks for your reply Ingo.


I did a factory reset of the P50m and connected earphones
to the module and did other tests..
It seams that this module (after a factory reset) has different reverb settings
depending on the selected voices. Reverb settings can vary (0 to 127max) from 048, 071, 000 depending
on the selected voice. So.. I found that some voices ‘show’ more their reverb than others
which need theirs to be cranked higher to be heard.

I finally consider as Ingo stated that the reverb is a digital one
with no involved analog hardware… functioning probably Ok.


De : Synth-diy <synth-diy-bounces at synth-diy.org> De la part de Ingo Debus via Synth-diy
Envoyé : 29 mai 2023 11:20
À : SDIY List <synth-diy at synth-diy.org>
Objet : Re: [sdiy] Yamaha P50-m inner reverb effect low level issue..



Am 29.05.2023 um 15:31 schrieb Jean-Pierre Desrochers <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca> >:


Still looking for advices on that problem


Schematics would be helpful. Anyone?

The effects chip in the VL70-m I mentioned earlier (same era) is a HD62098. It processes the digital data directly from the sound generator chip, there’s nothing analog in between. The dry/wet mixing is done digitally too. So I think it’s unlikely that a bad component causes a too low reverb amount.

Maybe some (probably hidden, Yamaha loves that) parameter is set to a wrong value? Does the P50-m have a lithium battery to power a static RAM when the device is turned off? If yes, is it still good?

Is there a way to „factory-reset“ the P50-m?



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