Hertz Donut MK1 - pitch drift

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tuj
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Hertz Donut MK1 - pitch drift

Post by tuj » Mon Aug 28, 2017 12:56 pm

Hi:

I have a Hertz Donut mkI and the pitch will drift from time to time fairly substantially, like a 5th or an octave or more. Then it will eventually drift back to normal.

Any ideas?
Last edited by tuj on Mon Aug 28, 2017 6:16 pm, edited 1 time in total.

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mt3
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Re: Piston Honda MK1 - pitch drift

Post by mt3 » Mon Aug 28, 2017 5:57 pm

tuj wrote:Hi:

I have a Piston Honda mkI and the pitch will drift from time to time fairly substantially, like a 5th or an octave or more. Then it will eventually drift back to normal.

Any ideas?
Is this while scanning through waveforms?
Or a static waveform?

tuj
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Re: Piston Honda MK1 - pitch drift

Post by tuj » Mon Aug 28, 2017 6:17 pm

mt3 wrote: Is this while scanning through waveforms?
Or a static waveform?
I was confused and thinking of the wrong module name. The problem is happening with my Hertz Donut.

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Post by mt3 » Mon Aug 28, 2017 10:17 pm

Ah, makes sense.

Do you have anything plugged into the 1V/Oct of the HD?

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Post by tuj » Tue Aug 29, 2017 1:24 am

mt3 wrote:Ah, makes sense.

Do you have anything plugged into the 1V/Oct of the HD?
Yes, Rene. It will follow the sequence correctly for a while, then glissando slowly up to a higher pitch, stay there for a while, and then glissando back down to C where I have it tuned.

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Post by mt3 » Wed Aug 30, 2017 4:09 am

Does drift happen without Rene plugged into the HD?

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Post by tuj » Wed Aug 30, 2017 6:00 am

No, with nothing plugged into the 1v/oct input, the pitch stays steady.

The rene when sequencing other oscillators is fine.

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Post by mt3 » Wed Aug 30, 2017 8:21 am

What happens when you plug the HD's Modulator into the 1V/Octave?
Also does the Modulator oscillator also drift?

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Post by mt3 » Wed Aug 30, 2017 8:27 am

Part of my guess is the Modulator is affecting Primary at a frequency just above 0 Hz, where the modulation bus is also non-zero.
What happens when you assign 0V to the Modulation bus CV while doing your thing with the Rene.

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Post by mt3 » Wed Aug 30, 2017 8:48 am

And pretty sure the Modulator never reaches 0 Hz, by design.

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Post by governor blacksnake » Wed Aug 30, 2017 6:54 pm

Sounds like the trimmer needs to be replaced. Email support@industrialmusicelectronics.com if you want us to take a look at it (email works now)

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Post by mt3 » Sat Sep 02, 2017 1:46 am

Dsmn, I was close.

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Post by tuj » Thu Sep 07, 2017 11:30 am

did some more testing. Both the modulator and the primary are drifting without anything plugged into them.

Will email for support. Thanks!

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