Re: [AH] Wiring standard for synth expression pedals?

From John Emond
Sent Mon, Dec 10th 2018, 04:03

Our Pedz Eurorack module has ground on sleeve, +12V on ring, and wiper on ti=
p. It doesn't work that well with the Yamaha FC7, audio. It works perfectly w=
ith the Roland EX5, linear. It also worked well when tested with a really ol=
d Moog passive pedal, again linear. Pedz includes a VCA as well as uni and b=
ipolar attenuators.

Cheers,

John


> On Dec 9, 2018, at 12:36 PM, Sam Mims <xxx@xxxxxxx.xxx> wrote:
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> First of all, there are active pedals and passive pedals, and they are all=
 called expression, CV, or other names.  The active pedals PRODUCE their own=
 voltage (so they must be powered), and these are for use with vintage synth=
s.
>=20
> More current products (90s for sure, maybe earlier) use passive expression=
 pedals, where the pedal takes a voltage generated by the keyboard, and then=
 doles it out back to the keyboard in the appropriate amount (depending on t=
he position of the pedal).  An active pedal will have a phone plug with two c=
onnectors (TS, voltage and ground), while a passive pedal will have a 3-cond=
uctor (TRS) phone jack - one for incoming voltage, one for voltage back to t=
he synth, and one for ground.
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> The Ensoniq pedal is passive, and there are definitely two flavors of pass=
ive pedals.  If I recall correctly, one uses a linear pot, and the other use=
s an audio-taper pot.  I remember once on the road some of our gear got stol=
en, and I had to use a Yamaha expression pedal with my Ensoniq boards.  All t=
he =E2=80=98business=E2=80=99 of the pedal happened in just a few degrees of=
 travel of the pedal.  So while you will get results using the wrong type of=
 pedal, they won=E2=80=99t be usable in a practical situation.
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> I have not, though run into a situation where the pedal is wired different=
ly=E2=80=A6
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> Sam Mims
> Syntaur
>=20
>=20
>=20
>> On Dec 9, 2018, at 4:22 AM, Thomas Strathmann <xxxxxx@xxxx.xxx> wrote:
>>=20
>> On 09.12.18 08:24, Brian Willoughby wrote:
>>> I just ran into a situation where my Ensoniq Expression Pedal is not com=
patible with a new USB-MIDI controller. Is there one standard for wiring a p=
assive expression pedal, or is there more than one?
>>=20
>> Yes. My expression pedal has a switch to select different configurations.=
 It's the same mess as with sustain pedals.
>>=20
>>    Thomas
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