Re: Question about using old Yamaha expression pedal

[david <gnome@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxx> wrote:
> > >           
> > >           
> > > > On Wed, 31 Aug 2022 18:06:59 -1000
> > > >             
> > > >             "David W. Jones" <gnome@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx
authenticity, honesty, community
http://dancingtreefrog.com
"My password is the last 8 digits of π."
  

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