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Author Topic: Controlling vco3  (Read 383 times)

mick3950

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Controlling vco3
« on: November 07, 2018, 04:16:51 pm »
How can I control vco3 from an external sequencer,any help appreciated,

DrJustice

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Re: Controlling vco3
« Reply #1 on: November 07, 2018, 09:43:50 pm »
I assume here that you'll not be using MIDI for VCO 3 and that you want separate control of just VCO 3 (from VCO 1 and 2) when the synth is being played.

You can use Expression 1 or 2 on the back of the synth as CV inputs. These are available as sources in the bottom two rows of the matrix. Lets' use Expression 1 in this example

 - Assign one of the user assignable mod matrix columns, say #13 to VCO 3 Coarse
 - Assign Exp1 / M3 to column 13, so that Expression 1 will now control the pitch of VCO 3
 - Switch off Kbd Track for VCO 3, so that it will not follow the keyboard/sequencer/arp
 - Adjust the Mod Amount of the Exp1 / M3 to column 13 assignment until you have the pitch tracking right
 - Adjust VCO 3 coarse to set the tuning

The last two steps requires a little fiddling. Play alternating notes at an octave interval and adjust the Mod Amount until VCO 3 plays that same octave interval. Use the VCO 3 Coarse knob to adjust the pitch bias. Repeat this until VCO 3 tracks the octave interval and is at the right pitch.

The Expression inputs accept 0V - 3.3V so it'll cover 3.3 octaves if you use a standard 1V/oct CV. The Expression inputs use the following connections: Tip = pot center tap; Ring = 3.3V; Sleeve = Gnd. So use a TRS cable with the ring unconnected, your CV connected to the tip and ground connected to the sleeve.

 

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