[sdiy] Adding a second VCO with level control

[Harry Bissell]

Wire the pot with one leg to ground, one leg to the VCF input, and the wiper to your VCO output.
Include a 1K (or so) resistor in series between the VCO and the wiper of the pot.

The idea is with the wiper at one end, the signal goes full strentgh into the VCF. At the other
end of the wiper travel, all the VCO signal is shunted to ground, but the full resistance of the pot
is still between the VCF input and ground.

This is a common wiring method for two pickup guitars, where you don't want to have one pickup's volume
control short out the other pickup's output...

H^) harry



----- Original Message -----
From: Altitude <altitude at optrand.com>
To: 'Synth DIY' <synth-diy at dropmix.xs4all.nl>
Sent: Sun, 20 Mar 2011 19:21:52 -0400 (EDT)
Subject: [sdiy] Adding a second VCO with level control

Greets list,

Please excuse my ignorance if this is an obvious thing.

I regularly add a second VCO to my x0xb0xes and have been using a simple pot
with one leg as input, the other to ground as a way to control the level of
the signal however I have noticed that if I turn it ALL the way down, it
silences both VCOs since (I assume) it shorts the VCF input to ground.

  Can someone suggest an elegant way to deal with this?

Much Obliged,
Raph

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-- 
Harry Bissell & Nora Abdullah 4eva