Dual Bernoulli gate

Two Bernoulli gates. Each of them route each incoming gate/trigger to either of its two outputs. The decision is random, with a controllable amount of randomness (pots + CV input).

Two control modes:
- "Direct" in which HEAD = output A ; TAIL = output B.
- "Toggle" in which HEAD = stay on the same output as before ; TAIL = switch to the other output.

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