Oscillator 1 gets out of tune.

[Matthias]

Hello here, I'm new to this forum !   

I bought last year (occasion) a Prophet 6 from 2021. Dream synth ! I love it. I'm using it mostly live since a few months.

So maybe it's because it's very warm, summer, now, but there is an issue. I visited all possible forums and posts... I did : Reset global values, reset pitchbend values... re-re-re-calibrate...
Now that I write this, intern temperature is 53 - Version 1.7.5. ...

Now with a basic preset, Slop on 0, no LFO, no effect, no sub, no pan.
Oscillator 2 is staying in tune, no matter what.
Oscillator 1, as soon as being played, is moving around, to 25 cents up, sometimes going 20 cents down and up again. If I stop playing, it goes down again (-20) if I start playing it will go again up... Sometimes, luckily, back to 0.

All presets where oscillators are in sync are fine. But as soon as I need to un-sync them, it's a mess.

Last concert, it suddenly detuned itself (half tone in a matter of seconds...) in the middle of a song... Had to proceed to a calibration on stage - praying the guitar solo would be long enough (Luckily, guitarists ) On stage, I didn't have time to figure out what the problem was - probably temperature issue...?

Am I missing something, some hidden parameter?
Thanks in advance for the help !

[thirteen_engines]

If you do a calibration and the oscillator is still out of tune, I would expect that the oscillator board isn’t functioning properly. Contact Sequential about the problem. They are usually extremely helpful. Let us know how things go.

[Quatschmacher]

Did you clear out the oscillator/filter tuning tables? There’s an extra command for that. You’ll then need to repopulate them by pressing preset+0 every time the tuning moves until there’s enough data.

Did you also calibrate the mod wheel? That can cause issues as an LFO can still be applied when the wheel is at zero if the minimum wheel value is off.

[Matthias]

Hello,
Thanks for the reply !

Did you clear out the oscillator/filter tuning tables? There’s an extra command for that.

Any idea or link explaining this a little more in detail? Thanks in advance

For the mod wheel, if the LFO doesn't link to any parameter, it shouldn't affect the pitch, right? I'll give it a try anyway before I contact the support.

[Quatschmacher]

Hello,
Thanks for the reply !

Did you clear out the oscillator/filter tuning tables? There’s an extra command for that.

Any idea or link explaining this a little more in detail? Thanks in advance

For the mod wheel, if the LFO doesn't link to any parameter, it shouldn't affect the pitch, right? I'll give it a try anyway before I contact the support.

Press PRESET+3

As detailed here:
https://support.sequential.com/hc/en-gb/articles/5315353892242-Prophet-6-Keyboard-Troubleshooting

[thirteen_engines]

Hello,
Thanks for the reply !

Did you clear out the oscillator/filter tuning tables? There’s an extra command for that.

Any idea or link explaining this a little more in detail? Thanks in advance

For the mod wheel, if the LFO doesn't link to any parameter, it shouldn't affect the pitch, right? I'll give it a try anyway before I contact the support.

Press PRESET+3

As detailed here:
https://support.sequential.com/hc/en-gb/articles/5315353892242-Prophet-6-Keyboard-Troubleshooting

Well, I just learned something new (to me) about the P6! Thanks.