[A6] Some waveform observations

[David Evans]

On Sun, Nov 21, 2004 at 11:18:07AM +0100, Robert Skerjanc wrote:
> 
> 1. the basic waveforms of the VCOs look very strange, when you see them 
> on an oscilloscope.

  Many synths have crazy-looking waveforms due to design of the VCOs and
because of other parts of the signal path.  It's part of the source of
fun.

> 2. The VCOs have linear and expon. type of FM. Normally the linear type 
> is intended for the modulation to stay in tune (negtive slopes detune 
> the carrier in same amount as positive slopes), like the DX7. However 
> linear FM on A6 stays not in tune. Possibly the reason are the weird 
> waveforms mentioned above?
> 

  Certainly if they're asymmetrical about the zero axis then that could
happen.  I'm afraid I'm not sufficiently awake to say any more.  ;-)

-- 
David Evans                                         dfevans at bbcr.uwaterloo.ca
Research Associate, Ph.D. Candidate        http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo         "Default is the value selected by the composer
Ontario, Canada           overridden by your command." - Roland TR-707 Manual