Moog Voyager old school , cutoff acting as pitch

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Brett123
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Moog Voyager old school , cutoff acting as pitch

Post by Brett123 » Sun Apr 11, 2021 8:24 am

Hi there ,

My Voyager old school seems to be stuck in a mode where the cutoff is acting as a pitch wheel and won’t change .

Is it just a setting I’m stuck on ? Or could be fault Ic ?

Thanks ,

Brett

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meatballfulton
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Re: Moog Voyager old school , cutoff acting as pitch

Post by meatballfulton » Sun Apr 11, 2021 1:47 pm

Are you saying that adjusting filter cutoff knob causes the pitch to change? That would be a pretty good trick since the OS doesn't have any kind of digital parameter control.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.

Brett123
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Re: Moog Voyager old school , cutoff acting as pitch

Post by Brett123 » Sun Apr 11, 2021 9:40 pm

I got this answer on another forum “

What you describe sounds like the filter is stuck on self resonance, which is probably to do with the circuit under the resonance pot. I don't think that part is voltage controlled, so it may be the pot itself that needs replacing.”

Does this sound right ?

Thanks again,

Brett

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meatballfulton
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Re: Moog Voyager old school , cutoff acting as pitch

Post by meatballfulton » Mon Apr 12, 2021 12:46 am

Yes, if the filter is self resonating, then it will generate a sine wave at the current cutoff frequency. So, adjusting cutoff will change the pitch.

Try this: turn off ALL the oscillators. If you still get a tone, then it's the filter in self-resonance. Turn down the resonance knob. If nothing changes, then the circuit is indeed broken.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.

Brett123
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Re: Moog Voyager old school , cutoff acting as pitch

Post by Brett123 » Mon Apr 12, 2021 10:20 am

Ok, thanks a lot for the help .

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