The Official Sequential/Oberheim Forum

SEQUENTIAL/DSI => Prophet-5/Prophet-10 => Topic started by: mschorer on March 03, 2023, 10:09:53 PM

Title: Prophet Rev 4 not keeping 440Hz tuning
Post by: mschorer on March 03, 2023, 10:09:53 PM
My Prophet 5 Rev 4, 2022 model experiences the following problem: When I hit Tune then the instrument tunes all the oscillators perfectly, but not to 440Hz. The tuning randomly is off so far that I either have to turn the master tune knob all the way to the left and next tuning cycle all the eay to the right. Having the tuning knob in center position never gives me 440Hz tuning.

Does anyone experience this? And is there a fix?
Title: Re: Prophet Rev 4 not keeping 440Hz tuning
Post by: Quatschmacher on March 04, 2023, 12:14:39 AM
Is one of the non-standard tuning tables selected in the globals menu perhaps? Set it back to equal temperament.

If that’s not it. You could try clearing the tuning calibration tables (record+tune) and repopulating them by hitting “tune” every time it needs it.
Title: Re: Prophet Rev 4 not keeping 440Hz tuning
Post by: dr.sax on March 06, 2023, 12:33:07 AM
Also check that the latest firmware is installed. It is always posted in the first thread of this forum.