[sdiy] pulser mod and demo

[Ian Fritz]

Hi all --

It seems like a good idea to have at least a couple of parameters to vary 
in a waveshaper.  (As seen by the great domos of Jim's multi-break-point 
shaper that were recently posted.)  So I've reconfigured the 5Pulser shaper 
to allow a second kind of waveform variation.

In this reincarnation two comparitors are connected to the LM3914 outputs, 
the first to outputs #1, 5 and 9, and the second to ouptuts #3 and 7.  The 
first set is always output at 5 V peak, whereas the second set has a 
variable (voltage controlled) amplitude between +5 and -5V.

The effects of the pulse-height modulation are a bit more subtle than the 
main pulse-number modulation,  but there is a large range of useful new 
timbres available.  A second demo showing this added modulation capability 
is now up at my web site:

http://home.earthlink.net/~ijfritz/xfer.htm

   Ian