there are only 2 recordings ever being made, L and R. the balls just cause the recording speed/direction/position to change, depending on where the ball hits a wall/bound (and the balls probability setting).
speed mod = random choice of speed (.5, .6703, 1, 1.4983)
flip = change direction of tape
skip = reset loop to beginning of buffer
the recording works very much like tape, so unfortunately there is no way to undo a bit of a recording.
edit: off topic, but i plan to make the speed mod table/scale editable in a future version. if you’d like to change them before then, it’s as easy as editing one line of code. line #48

just change the numbers to whatever 4 selections you’d like.