On 01/09/2022 09:57, david wrote:

On 8/31/22 22:31, Will Godfrey wrote:

On Thu, 1 Sep 2022 09:33:11 +0200
Alexandre DENIS <contact@alexandredenis.net> wrote:

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

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

Thanks!

Hi,

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
auto-detected.

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

-a.

For this sort of thing, and testing leads, PSU polarity etc. a small cheap
meter is invaluable. Takes all the guesswork out of it - so you see what you
*actually* have, not what it says it has!

I have a meter. Will just have to figure out how to test this using it!

David,
crude ASCII sketch of typical TRS pedal:
S    R    T
|    |    |
|    V    |
WWWWWWWWWWW

A RTS pedal simply re-labels R and T.

Set the pedal mid-way, set meter to KOhms, measure resistance between sleeve and ring, sleeve and tip.
You should find one if about half of the other (if a log pot it may be way off half, but at least less
than.) The lower reading is the slider. Either way, the best way to test is to simply try it.

Bill

Thanks, Bill.

Now I just need to track down a weighted, 88-key, MIDI controller with aftertouch and an assortment of pitch bend wheels, knobs, sliders and pads.

I was going to get an Akai MPK-88 several years ago, but they're no longer made, and Akai no longer offers anything with 88 keys.

Others on the list:

M-Audio Hammer 88 Pro

StudioLogic SL88 Studio USB MIDI controller

Arturia KeyLab 88 USB MIDI Keyboard

I'm not looking for a synthesizer keyboard with its own sounds.

Ideas?

-- 
David W. Jones
gnome@hawaii.rr.com
authenticity, honesty, community
http://dancingtreefrog.com
"My password is the last 8 digits of π."