[LAU] Question about using old Yamaha expression pedal

[david]

On 8/31/22 23:21, Bill Purvis wrote:
> 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 at alexandredenis.net> wrote:
>>>
>>>> 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!
>>>> 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 at hawaii.rr.com
authenticity, honesty, community
http://dancingtreefrog.com
"My password is the last 8 digits of π."
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