As for the couple issues created when trying to playback songs that have a different BPM setting on the two-
Such as songs going silent and waveforms not keeping up.
Does it have to do with songs being eternally editable? Being that you can have only one BPM per song. This wouldn’t be a problem except for the underlying issues.
Could there not be just a playback mode where each unit doesn’t look for the others BPM?
As it is, even to play back a completed song we have to change the BPM on the Aeros to match each individual song.
Maybe have EDIT and PLAYBACK modes?