Expression pedal volume use

[jimbobothy]

Hey all,

I've just bought a Korg XVP 20 pedal to use with my SV1-88 and I've found the default volume (when using the expression jack) works back to front, ie. full volume is with the pedal pushed forward, volume (nearly) off is pedal lowered.

Is this what I can expect if I try another expression pedal?

Any thoughts would be appreciated folks.

[voip]

Pedal pushed with the toe = volume up, pedal pushed with the heel = volume down is the correct way round.

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[jimbobothy]

Pedal pushed with the toe = volume up, pedal pushed with the heel = volume down is the correct way round.

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Cheers voip, thanks for correcting me on that as I had no idea! I've ordered another expression pedal so I can compare their linearity anyhow.

I think I'll probably keep the XVP 20 as a decent stereo volume pedal anyhow now as you can't use both funtions at the same time (for obvious reasons )

Thanks for your reply.

[voip]

The SV-1 pedal calibration allows expression pedals of either "polarity" to be taken into account. It also means that if the preference is for minimum volume to be with the pedal pushed fully forward, then starting the calibration with the pedal in this position will allow the SV-1 to work out that this is the minimum volume position.

The Korg XVP-20 pedal allows both functions i.e. stereo audio volume and expression to be used at the same time, because the potentiometers for each are completely separate, albeit sharing a common ground.

The XVP-20 expression potentiometer is a 50k linear one, whilst the volume potentiometers are each 50k log, with up to 50k more added to the bottom ends of the pots using the minimum volume control.

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[jimbobothy]

Thanks again for your input voip.

I was thinking of using both at the same time (ie wah control and stereo volume) to be non compliant. Would you suggest using maybe the stereo volume with the expression controlling a MIDI function plausible concurrently?

[jimbobothy]

Hey again,

I've tried calibrating the pedal the opposite way, however the volume function does not work (there is sound but no volume change at all with the pedal up or down) but the wah function works the same as before (dark wah pedal heel down, bright wah pedal toe up).

Regarding the pot log/linear values, I do find that most of the business appears to happen at the top end with a larger increase in volume rate there when using the expression function, whereas the stereo volume appears more even across it's sweep.

I had hoped for the same feel when using both the stereo volume and expression volume but alas, not to be I think.

Peace.