9720 Pitch Issues
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Author:  Kyhotay [ Wed Apr 18, 2012 9:28 pm ]
Post subject:  9720 Pitch Issues

Heya Scott,

I can't swear by this, but it seems ever since I added the "ripple destroyer" R-C thingamajig, my 9720 has been changing pitch in relationship to the cycle mode. Besides parasitic modulation, I'm also having tracking errors I didn't have before. I can only track about a fourth interval where as before I could easily go 3-4 octaves. I've pulled he module from the rack without hearing any pitch differences. I even put duct tape on the rear panel so the R-C wouldn't short.

Any suggestions as to what might have suddenly changed the VCOS behavior?

Side note: do you offer the 9720 in an assembled version? If so, how much? I'm thinking about maybe needing another multi waveform LFO.

Thanks in advance!

Brian Folkes

Author:  PAiA-Scott [ Mon Apr 23, 2012 10:36 am ]
Post subject:  Re: 9720 Pitch Issues

I can imagine it is the ripple destroyer dropping too much voltage to the 9720 VCO. I'll look at this on mine. For the time being, can you move it to be situated as the link between the VCF and VCA instead of the MIDI2CV8 and the VCO?

Author:  PAiA-Scott [ Mon Apr 23, 2012 10:39 am ]
Post subject:  Re: 9720 Pitch Issues

Sorry, but the components of the P9700S aren't listed as ASM (assembled). only the newer modules in this 9700 series.

Author:  Kyhotay [ Mon Apr 23, 2012 3:18 pm ]
Post subject:  Re: 9720 Pitch Issues

OK, I'll try that and see if it works. Let me know if you come up with another solution. Anyone else report these problems?


Author:  Kyhotay [ Wed May 30, 2012 12:58 pm ]
Post subject:  Re: 9720 Pitch Issues

Problem solved, Scott! I ended up running a cable from the 9771-15 power supply to the VCO, added headers on all the power I/O for the 3 9700S modules, disconnected the power out from the MIDI8CV and everything is fine, the VCOs track each other over 5 or 6 octaves and it sounds cleaner and more stable.

I also added headers to the 9771-15 just to make life easier.

Thanks for the off-line info on this.


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