zipper noise was: digital control

[WeAreAs1 at aol.com]

In a message dated 1/12/00 10:07:51 AM, you wrote:

<<You use a DAC with a very large number of bits,

taking the incoming 0-127 controller levels you

predict a series of higher resolution line segments

based on the spacing of the controller messages.


That is to say the microprocessor is continuously

trying to predict a line segment that will arrive at

the next controller point in time with the message.>>

That's pretty sophisticated, for sure, but I don't think they're doing that 
on the ATC-1.  It has no zippering if you sweep the filter from the front 
panel knob (or an envelope), but it has noticeable zippering if you sweep it 
from an external CC.  I think the external MIDI control resolution is still 8 
bits (ignoring the 8 LSB's of the 16-bit DAC).  I could be wrong here.  
Anybody out there have an ATC-1?

Mike B.