Here is a patch that I've had fun exploring. I'm sure all the experts in the group have 
tried this but many of you may have not.

Modules needed: 
4 oscillators
1 sample/hold

Put a ramp wave from osc 1 into the input of the s/h. Connect osc 2 to the gate of the 
s/h. Use the s/h output to control the pitch of osc 3.

Set osc 1 and 2 in the low freq range and tune them to the same frequency. When the 
frequencies match the pitch of osc 3 will remain constant or change by tiny increments. 
This is because the ramp wave will be sampled at the same point in each cycle.

When osc 1 is slightly faster then osc 2 you will hear an ascending series of pitches. 
Decending when osc 1 is slower. Increasing the frequency difference between osc 1 
and osc 2 will increase the pitch intervals produced by osc 3.

Set osc 4 to a frequency lower that of osc 1 and 2 and modulate the frequency of osc 1 
by a tiny amount. The notes should now be alternating between ascending and 
descending patterns.

Experiment with the osc 4 frequency and the modulation amount of osc 1. Small 
changes can yeld radically different results.

When Roger builds his quantizer (with various selectable scales I hope), put it 
between the s/h and osc 3 and this will sound even better. 

David W. Skinner