wowowow, that sounds excellent! thank you for sharing. what was the sound source on this? it’s perfect.
hmm. this isn’t consistent with intent or my test results – would you be willing to try this workflow?:
- start a fresh cranes session, default values.
- record about 6 seconds of audio, which should write into buffer 1 and buffer 2 simultaneously.
- turn on full overwrite for buffer 1 / voice 1 (o1 = 1). this should eventually erase the content in buffer 1.
- once buffer 1 is clear, overdub (so, o1 = 0.0) and play something different.
- you’ll have two distinct loops going on L + R channels. toggle overdub off.
- switch the voice 2 buffer reference to 1.0 in params
- you should hear voice 2 now playing exactly what voice 1 is playing.
- on the main performance screen, use K1 to toggle focus to voice 2 and set o2 = 0.25. hit K2 to begin overdubbing.
- as you play, voice 2 will write into buffer 1 – since voice 1 is also referencing buffer 1, the changes should take be constant between the two voices.
- toggle overdub off (K2)
- head back to params and switch the buffer reference back to 2.0
- you should hear the original first take audio.
if those steps return the results described, this means (to me) that the parameter controls which buffer voice 2 is referencing, exclusive – buffer 1 or buffer 2.
if no, please let me know what variance you run into so I can further troubleshoot! 
(fwiw, voice + buffer are separate terms – in standard config, voice 1 writes to / plays from buffer 1 and voice 2 writes to / plays from buffer 2. by toggling the buffer reference param, voice 1 continues to write/play buffer 1 but voice 2 will write/play buffer 1 as well. )