[sdiy] Hey Scott, Pro-One Modifications

[Scott Juskiw]

A few years ago I made some modifications to my Pro-One synth while I 
was installing a Kenton MIDI interface. I've written up the details 
of these mods and posted them on my website. There's pictures, 
sounds, schematics, etc.

Modification Summary:
	* 	Replaced the white noise source with a new circuit 
that provides white, pink, red, and infra-red noise. A rotary switch 
selects the noise colour.
	* 	The new noise source can act as a modulation source 
in addition to its role as an audio signal. A pot sets the noise 
level fed to the buses. A rotary switch selects whether the noise 
signal feeds the Direct or Wheel modulation buses.
	* 	Added a Sample & Hold circuit. The new noise source 
is the signal input to the Sample & Hold. The LFO square wave is the 
clock. The Sample & Hold output can be used as a modulation source.
	* 	The pulse width of the LFO signal can be adjusted 
from 0% to 100% with a pot.
	* 	The LFO signal can be inverted. A rotary switch 
selects LFO non-inverted, LFO inverted, or Sample & Hold as a 
modulation source.
	* 	Added a triangle wave for oscillator A. A pot allows 
manually mixing between the triangle and sawtooth waves.
	* 	Filter resonance can now be used as a modulation 
destination. A rotary switch selects from either the Direct or Wheel 
modulation buses as a source.
	* 	The filter envelope can be inverted. Inverted and 
non-inverted envelopes can be applied to filter frequency and the 
Direct or Wheel modulation buses via two slide switches.
	* 	The filter frequency signal from the Kenton MIDI 
interface can be assigned to the Direct modulation bus. A pot sets 
the signal level fed to the bus.

http://www.tellun.com/proone

BTW, how come there are so many Scotts on this list? We were all 
doomed to synth-diy just because of what our parents named us? Speak 
up Scott, I can't hear you.