Dynamically adjusting the number of channels of a polyphonic signal

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Another one to try could be the Polyphonic Selector from the Sparkette’s Stuff plugin:

Sparkette's Stuff Polyphonic Selector

A small sample patch at:

Utilities for polyphonic channels

Polyphonic Selector (Sparkette’s Stuff) With this module, you can select one or more outputs from a polyphonic input signal (INPUT) through the voltages of another polyphonic input (SELECT). Feed your primary polyphonic signal into the INPUT port. At the SELECT port, connect a polyphonic signal to control which input channel from the primary signal is displayed in the respective output channel. The number of channels of the selector signal determines the number of output channels (up to 16). U…