related: Effects after Reverb? , but that was before the "control bus" concept? Now that's two topics (effects: order/local/global, control bus) that could use more documentation.
(I've been meaning to work on that. I am being delayed by other obligations. I still want to do this, or help others doing it. The way to contribute docs is to fork GitHub - tidalcycles/tidal-doc and send PR?)
I thought a "control bus" describes routing of parameter values (from Tidal to SC synthdefs), not routing of audio streams? (control buses do not change the audio processing chain? their purpose is to change parameter values while a synthdef is running - without re-triggering it?)