Stupid Yamaha DJX-IIB tricks

[WeAreAs1 at aol.com]

In a message dated 10/24/00 4:16:32 PM, grichter at execpc.com writes:

<< The actual XG synth engine is a DSP powered from 3.3 volts.  >>

Hello Grant,

I'm not sure that the XG tone generator chip should be called a "DSP".  It is 
a custom Yamaha chip that basically does sample playback, and except for its 
(external) sample ROM, is the same chip that can be found in many other 
Yamaha XG/GM products, from their professional keyboards and modules to most 
of their consumer-line portable keyboards.  Yamaha usually simply refers to 
these chips as "TG", or Tone Generator chips.

I 've played a bit with the first version of the DJX, and I thought it was a 
whole ot of fun.  Doesn't the DJX-II have some sort of user sample playback 
capability?  If so, your idea of putting it under CV/Gate control would 
definitely be interesting.  Do you know of any VCO designs that will reliably 
operate up to around 17Mhz and track 1volt/octave CV?

<<The "turntable" is an encoder, more difficult to interface a voltage to.>>

But not necessarily impossible...  Does the scratch wheel work as a pitch 
bending device?  If so, what is the upper and lower pitch range?

Best regards,
Michael Bacich