Keyboard circuit (was Stretch tuning a resistor string)

[WeAreAs1 at aol.com]

In a message dated 1/21/00 7:37:05 AM, you wrote:

<<I don't have Xpander schemos, but what you describe is what I'd have
expected,
sort of. Still one question remains: How did they compensate the external
CV inputs then ? Something like running them thru a fixed-reference ADC
and then thru the regulated-reference DAC ?>>

I don't know if this answers your question, but the Xpander's external CV's 
are quantized.  I don't have an Xpander, so I don't know how coarse the 
quantizing is (they might be quantized to half-steps!).  I think the main 
purpose for the external CV's (in the viewpoint of Oberheim) was to allow the 
user to drive his Xpander from the CV outputs of the old Oberheim DSX 
sequencer (maybe they weren't yet sure if this MIDI thing was going to catch 
on...).  The DSX CV output was quantized to half-step intervals.

Michael Bacich