The 8 buffers share RAM, up to 8m28s. You can record 8 tracks simultaneously, up to 1m03s per track.
You can use several buffers linearly, with several patterns, in order to record a specific length without having to stop it. (64+64 steps for instance).
You can define a recording length with Reserve Length (unit = seconds, not precise, but you can see corresponding length in steps).
A recording buffer can record itself : you can playback a recording on a track, and record it with the same recording buffer.