FW: WOOHOO! WAHWAH!

[J Brookes]

-----Original Message-----
From:	J Brookes [SMTP:jezz at enterprise.net]
Sent:	Tuesday, September 09, 1997 5:10 PM
To:	Synth DIY Mailing List (E-mail)
Subject:	RE: WOOHOO! WAHWAH!

        My YS200 now has a wah wah pedal attached to its breath controller
     port. I had an old Mister Cry Baby (which is broken beyond all belief) 
     given to me years ago by a friend. SO - I stripped out all the
     components and plugged in a 250K pot and a ~100K resistor and now I
     can pedal away the hours (the YS200 lets you modify the 'tone' of the
     sound based on aftertouch or breath controller). I am very happy ;>

        Now I have done that the next big thing to do is to have the breath 
     controller wired to an external sound source and this my friends is
     where I get lost.

        The control is resistance (current) based, a signal comes out of
     the YS200 apply a resistance and feed that signal back in. How can I
     get a 'line out' style sound source to modulate that signal (or is an
     audio modulator exactly what I am looking for).

Sounds cool! I read somewhere on the web 
(http://tilt.largo.fl.us/studio/specdx27.html) about doing this from some 
guy. He did it with another Yamaha synth. All you need is as you say a pot 
wired into the breath controller.

I think he didn't use the 100k resistor you specify, just a 50k pot. If I 
recall rightly he connected the pot across the ring and sleeve of the jack 
with the pot wiper going to the tip of the jack.

To me this sounds like the sleeve and ring of the jack are GND and some 
volts with the pot as a divider feeding back into the tip of the jack. If 
this is so, you ought to be able to apply a voltage to the tip referenced 
to either the ring or sleeve, which ever is ground. You might want to limit 
the voltage with a bit of external circuitry though...

BTW, it's nice to hear of someone else using one of these things. I've got 
a YS100 (YS200 without the sequencer), my first ever machine. I've got an 
editor program for the thing on my web page 
(http://homepages.enterprise.net/jezz/). It's a Windows 3.11 program but 
I'm working slowly on an improved Windows 95 version. Sorry, no Mac version 
:(