I am less than two weeks in with my Octatrack. This is one of the features I was very interested in. Last night, I figured out a pretty good work around to avoid a midi control pedal (for now). This at least works for my limited purposes:
I set-out to record a 12 bar blues rhythm loop, played on my guitar. I found it worked best to record the beat, first, as the Master loop (this is the opposite of the tutorials I’ve seen, which add the beat, later). I set pick-up machine one to record length 48 (3 bars). I programmed a simple beat on Tracks 3 and 4, and then set recorder 1 to record Main. Hit record and play at the same time, to input the Master Loop.
I previously set Track 2 to overdub on Track 1 at length times 4, input set to A. I then hit record on Track 2, which began the overdub. I let it cycle through one time and then played in time with the beat. I ended up with my 12 bar loop.
I haven’t experimented too much beyond that. I believe you can save previously recorded loops in static, which can be loaded as one shot samples. I’m hoping this will overcome the memory issues, which seem to be the biggest obstacle in building loops.
I apologize for the length of the post, but one more thing: Once I fully understood the functions of the two record buttons (basically, left - record, right - play/stop), my errors and confusion were greatly reduced.
Octatrocius