pigtronix Infinity looper User Manual page 25

When an overdub is in the process of being
recorded (Loop LED is orange), pressing the
UNDO switch will cause the Infinity to permanently
erase that overdub at the end of the current loop
cycle. Any material from previous overdubs that
has already been merged with the initial
recording will not be undone.
When an overdub has been recorded and
closed (Loop LED is green), pressing the UNDO
switch will remove that overdub instantly and
retains the overdub for REDO if desired. Any
material from previous overdubs that has already
been merged with the initial recording will not be
undone.
Once you open and then close a new overdub,
the previous overdub layer will be merged with
the base layer at the end of the current loop
cycle and can no longer be undone.
Overdub Redo:
Once an overdub has been closed and then
"undone," it can be put back instantly by
pressing the UNDO remote switch once again.
You can UNDO / REDO an overdub as many
times as desired.