Stupid Yamaha DJX-IIB tricks

[danial stocks]

>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 74s124/ 74s624 /ls series also run to well into the mhz range I think I 
got one going up in the 10-20 mhz range, they certainly go to 10 mhz.. 
couldn't vouch for the lin... Saw a vco design based on the CA3046 
transistors years ago that was highly lin in this range.. have to see if I 
can find it.. If this XG chip runs on a sample rom, could be interesting to 
put your own roms in too... [I've had loads of fun loading my Oberheim DMX 
up with old eproms pulled from computers.!]
Cheers,
Dan



><<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

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