I was thinking about sidechain as a general routing feature, i.e. as an alternative to Series and Parallel, you could choose Preset B to side chain Preset A. For example: for HeadSpace in Preset A, the output of the playback heads gets routed to Preset B before coming back in on the record head. You could also put the Insert(s) into the sidechain routing, for example have a Reverb Preset A on the mains and mix it with Insert 1 to drive the Compressor in Preset B’s attenuation. Obviously sidechain would not make sense in every algorithm, which might require some handling in the UX, but there are so many cool possibilities here.
