pigtronix Infinity looper User Manual page 27

Pressing the Loop 2 footswitch while recording on
Loop 2 before it has reached the full SYNC MULTI
value will cause Loop 2 to close at the end of the
current loop cycle.
Holding down the SYNC MULTI switch will toggle
the SYNC MULTI function on and off from the
current setting without cycling through all of the
SYNC MULTI values.
Once material is recorded on Loop 2 in one of
the "sync" modes, the SYNC MULTI function can
be toggled on and off, but the multiplier factor
cannot be changed.
Series Loops:
When SERIES is selected, only one of the two loops
can be played back at any given time.
In SERIES mode, enabling playback recording on
a loop will immediately stop playback of the
previously selected loop, closing any overdub
that was in progress.
In SERIES mode, when recording on Loop 1,
pressing the Loop 2 footswitch will close Loop 1,
and will simultaneously arm and begin recording
on Loop 2. Pressing the Loop 1 footswitch next will
cause Loop 2 to close and will simultaneously arm
and begin playback on Loop 1.