One VCO is the only sound source, but modulated variously by four Universal Slope Generators:

1. Gated-Looping AR Envelope

2. AR Envelope

3. Cycling Envelope

4. ASR

These and other signals are mixed down to form two modulation signals - one for the rhythmic aspect and one for the spectral aspect, mixes 1 and 2 respectively. (figure 2)

Mix 1 Sources:

• USG 3

• Stepped Random

• Programmer Row A

Mix 1 Destinations

• USG 2 Rate

• USG 1 Rate 

Mix 2 Sources:

• USG 1

• USG 2

• USG 4

Mix 2 Destinations

• VCO Linear FM

• FM VCA CV

Mix 1 allows using a sequencer, stepped random, and a looping envelope to control the rhythm so one can define a base rate, provide random deviation, and shape rhythmic gradients.

Mix 2 modulates pitch and FM amount. It provides options for the amplitude envelope, a second AD envelope, and an ASR for interactivity. Attenuators on the VCA and VCO allow for selectively modulating these ganged parameters separately. Makes complex envelopes. For stepped pitch modulation I used a Rungler clocked by USG 1 (figure 3).

This is a sort of second-order modulation scheme, whereby the patch is basically building a stepped and smooth modulation source which modulates the sources which modulate the pitch and timbre.