[LAU] Question about using old Yamaha expression pedal

Alexandre DENIS contact at alexandredenis.net
Thu Sep 1 09:33:11 CEST 2022

On Wed, 31 Aug 2022 18:06:59 -1000
"David W. Jones" <gnome at hawaii.rr.com> wrote:

> Will a Yamaha expression pedal work on a non-Yamaha MIDI keyboard? It
> uses a stereo 1/4" plug.
> Thanks!


Some expression pedals are wired with the pot on TRS, some others use
RTS (i.e. wiper of the pot either on tip or ring). To make things worse,
some use a lienar pot, some others use a log pot.

AFAIK Yamaha uses RTS wiring. On the other hand, most pedals use TRS.
But in a lot of keyboards, the polarity is either tunable or

The only advice is to test the pedal on the keyboard, or to check in
its documentation.


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