[sdiy] Prophet 5 Poly-Mod / Filter Env calibration

[Tom Wiltshire]

Looking at the service manual (I was looking at Rev 3 - you didn't say which you have) I'd say try the P-Mod Env Balance trimmer for the voice at fault. It adjusts the envelope as it goes through the CA3280 VCA to the PolyMod, and an offset there would give the effect you're getting.
The P Mod Osc might do the same job since it also adjusts the offsets on the Poly Mod, but it's not really the right trim for the job.


On 19 Oct 2013, at 08:41, Gil W. <gil_we at yahoo.com> wrote:

> Hello friends !
> 
> Have a small question. Since I got it, my P5 acts the following way -
> 
> Under the Poly-Mod section if I set the Filter Env pot to minimum,
> and select the Freq A button ON, then on the Filter Env section set Attack, Decay and Release to minimum,
> turning the Sustain knob up and down, the pitch of Osc A changes as expected,
> but one voice will always sound too sharp and out of tune in respect to the other four.
> 
> I wonder what should be re-set, or which trimpot is responsible for this.
> see the following trimpot but unsure which one to set:
> 
> P-Mod Env Balance (for all 5 voices)
> Filter Balance (for all 5 voices)
> Filter Scale (for all 5 voices)
> P Mod Osc Balance
> 
> Thanks for any advice !
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy