RE: [looper's] RE: keyboard/volume pedal mods

[goddard.duncan@mtvne.com]

Title: RE: [looper's] RE: keyboard/volume pedal mods

 >>> Whoah, hey, how do you do that?
the evolutions are modified so that a volume pedal can be plugged straight in the back, and the onboard volume control then adjusts the upper limit of the pedal, returning to it's normal function when the pedal is unplugged. why oh why aren't they like this when you buy them? god knows it's simple enough...... <<

basic soldering skills required.
the volume pot in the keyboard has a fixed voltage at one end and is grounded at the other. the wire coming off the middle carries the actual control voltage representing the position of the control.

you take this wire off and connect the middle tag of the pot to the /end/ of the pot in your pedal, ground the other end of the pot in the pedal and bring back the middle connection to the wire you have left over.

a regular stereo jack socket can be used, if you can find somewhere in the controller keyboard to mount it. there's usually room near the other sockets.

also, you should arrange that the tip and ring connections are shorted together when the pedal is unplugged; this restores the onboard control to normal action. beware that you don't create a situation where the fixed voltage could be shorted to ground- the onboard pot's centre tag should go to the tip connection and the pedal's pot's centre tag should be the ring connection.

now you should have the onboard control governing the maximum voltage that can appear across the pedal's pot. wherever the onboard control is, it will determine the loudest the signal can be, while either control can be used to fade the signal to nothing. and the pedal can't go louder than the onboard pot is set.

I just don't know why keyboards don't come like this. it's much simpler than editing pedal control parameters in every patch.....

duncan/r.m.i.

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