Unfortunately there is no information on the midi parameters/expression or the footswitch. I assume the footswitch will be similar to the RC-3 (Stop/Tempo and Up/Down). They refer to a missing "Parameter Guide".
One miss is that writing phrases only occurs while stopped. This means that recording multiple live loops and switching between them is limited to the two phrases in the current memory location.
Would be great to be able to record live a C section (by saving current A/B phrases into a memory location 1, changing memory location, recording C and saving into memory 2) and then change between A/B/C that you just recorded at will. Or perhaps use separate memories for A versus B since changing a memory will likely start on A.
Suspect that write is not footswitch controllable anyway.
It seems neat but I don't like the drum loops that much more than the stock loops built into the RC-3. And I certainly don't like them as much as my Trio. I'll stick with my current setup but I'm glad to see BOSS attempting something like this.