TC-Helicon Play Acoustic - Reference Manual - Manual (Page 36)

Setup button/section
Play Acoustic – Reference manual (2014-07-16) 34
Loop page (5/7)
Input parameter
Use the Input parameter to set the input source(s)
for loop recording. The following settings are
available:
► Guitar
► Lead
► Aux
► Lead + Guitar
► Lead + Aux
► Guitar + Aux
► All: With the All setting, everything you hear
will also be recorded as part of the loop.
Undo parameter
Use the Undo parameter to switch the Loop
undo function on or off.
On setting
Undo is active and may be used to undo the last
change made to your loop. It is common to use
undo when you have added a loop section that
you are not happy with and want to try it again.
You can also press Undo a second time to redo
your last Undo action. This will bring a loop over-
dub back that you have removed using Undo.
In this mode, the total available loop time is 15
seconds.
Off setting
Disables undo, freeing some memory for addi-
tional looping.
In this mode, available loop time is doubled to
30 seconds.
Loop Feedback parameter
Use the Loop Feedback parameter to control the
amount of loop record feedback.
When recording a loop with multiple passes (or
parts), the signal from the first loop pass is add-
ed to the next, and so on.
If all of these passes were put together at full
(100 %) volume, the loop you are working on
would get louder and louder and LOUDER, so
you would end up with a distorted output signal.
The purpose of the Loop Feedback parameter is
to prevent this volume increase from happening.
When you record a new pass to the existing loop,
it is recorded at 100 % volume, but the existing
loop is blended with it at the Loop feedback set-
ting.
The calculation works like this:
Input + (Loop x Loop Feedback) = Loop output
I.e. input + (Loop x 90%) = output
(Run away! Scary math!)
Most users find the default setting of 98% works
well, but you may find a different setting that
works best for you.