Onomatopoeia title for this piece. Made a patch similar to the previous one on the Serge/Bugbrand. It is four cycling envelope generators, each triggering a sample and hold at the end of each cycle. The sample and hold takes one of the other envelopes as input and controls one of the others. A simpler version of a Quantussy Cell.
Out of this control patch come four stepped random voltages and four envelopes. There are two audio chains of MOTM-300 VCO -> MOTM 440 VCF -> MOTM 190 VCA. Then one goes through a Blacet Time Machine analog delay and the other through the Synthesis Technology E580 Resampling Mini-Delay in tape delay emulation mode. Thwee-Thwee effect is made with the Time Machine modifying the delay time from its internal envelope follower. What a clever designer John Blacet was!
The recordings were each made with different tweaks of the patch. But all free-running.
Part of Thwee that I didn’t mention was due to the long attack times of the envelopes over the VCAs. The reason for that was to avoid overloading the Time Machine delay with sharp attacks.