För den som vill ha en hel hög med vactrols i sitt system så finns RxMx!
6st vactrol-LPG's, crossfader, mixer, scanner, och tillsammans med FxDf
(fixed filter-modul) som kopplas ihop internt med den för "spectral
animation"

https://www.makenoisemusic.com/retired/retired-modules/rxmx/

"The RxMx music synthesizer module is a vactrol-based 6-input, 3-output
macro-lowpass gate and signal crossfader, based on Grant Richter’s
circuit idea for applying “cadavre exquis” (aka exquisite corpse, a
technique of serial blind composition) to modular synthesis. If
modulated by a Wogglebug, one will achieve modular “cadavre exquis.” If
patch programmed using a sequencer such as the Pressure Points/BRAINS or
René, modular “mélange automatique” (automatic re-mixing) could be
achieved. The Channel parameter selects which of the 6 Low Pass Gate
circuits is driven by the Level and Strike parameters and the Radiate
parameter turns on channels adjacent to the selected channel. At maximum
Radiate settings all six channels become active simultaneously. Radiate
therefore allows for voltage control of the complexity of the mix
ranging from 1 to 6 active sound sources, while Channel selects the
focal point of the mix."

https://www.makenoisemusic.com/retired/retired-modules/fxdf/

"The FXDf music synthesizer module is a 6 Band Fixed Filter.
Traditionally fixed filters are large modules having 8 to 10 bands, each
with a manual level control, but rarely any voltage control. The FXDf
is so small we had to abbreviate the words Fixed Filter and by providing
individual outputs as well as a header for normalled connection to our
RxMx 6 channel macro-lowpass-gate module, voltage control over level of
each band is possible through patching. In the past the Serge System
Fixed Filter used 6db/ Octave filters while the Moog Modular used 12db/
Octave filters. We liked the sound of both filter slopes, so we
implemented a way to use either or both simultaneously. In this way the
FXDf also allows for blending of two audio signals. We selected 6 bands
we found to produce the most sonic energy in typical Make Noise system
patches and also took care to space them wide enough that each of the
bands could be distinct from the others. This makes for quite an
impactful sound when independently modulating the amplitudes of the 6
bands using the RxMx or VCAs."