Sample Edit > Loop Edit - Korg Pa3XLe User Manual

Changing the sample length and finding
good-sounding loop points
To adjust the sample length and loop points, check the "Loop
On" parameter, then use the "Start", "Loop Start" and "End"
parameters to create a fine sounding cycling loop.
For example, you may have sampled an audio groove of an
exceeding length. Use the "End" parameter to cut the exceeding
portion at the end of the sample, and adjust the starting point of
the loop using the "Start" or "Loop Start" parameters.
Usually, checking the "Use Zero" parameter is a big help, to avoid
the loop clicks due to level mismatches.
Sample Edit > Loop Edit
The loop is a cycling portion of a sampled sound. It is a tech-
nique used to reduce the sampling time, cycling a portion of the
sound to create the sustain phase of the sound. After the attack
stage, most sounds repeat the same waveform during their sus-
tain stage. You may adjust the Loop Start point with the "Loop
Start" parameter, and the Loop End point (always matching the
Sample End point) using the "End" parameter.
This page lets you fine tune the loop points, by watching at the
Loop End and Loop Start points matching at the center of the
diagram. A good-sounding loop is shown as a continuous, non-
breaking line.
SM (Sample)
Selected sample.
Loop diagram
This diagram shows the "End" (Loop End) point on the left half,
and the "Loop Start" point on the right half of the screen. Use the
"End" and "Loop Start" parameters to adjust the loop.
Parameters
Start
See "Start (Sample Start)" on page 238.
Loop Start
See "Loop Start" on page 238.
End
See "End (Sample/Loop End)" on page 238.
Use Zero
See "Use Zero" on page 238.
Loop Lock
This fixes the length of the loop being edited.
Off The "Loop S. " and "End" parameters can be
edited separately.
On When the "Loop S. " or "End" parameter is edited,
the other one will be automatically adjusted so
that the distance between them (i.e., the loop
length) does not change. This is convenient when
you are creating a rhythm loop to match a spe-
cific tempo.
Loop On
Use this parameter to turn the loop on or off.
On The loop is turned on, and the portion of sound
included between the Loop Start and Loop End
points will cycle until a key is kept pressed. If the
"Loop Start" point matches the "Start" point, the
whole sample is cycled.
When the loop is turned on, a vertical yellow line,
showing the loop point, appears in the waveform
display.
Off The loop is turned off. The sound will play from
the Sample Start to the Sample End point only
once, even if you keep a key pressed on the key-
board.
Crossfade
When looping the pitched sample of a complex sound such as
strings or woodwinds to make the sound sustain, it is necessary
to create a long loop to preserve the rich character of the sound.
Crossfade Loop can be used to minimize the difference in pitch
and level between the beginning and ending of the loop region,
to create a natural-sounding loop. In order to solve such prob-
lems, Crossfade Loop causes the sound to change gradually from
the end to the beginning of the loop.
In practice, here is how it works. A specific length (the "Cross-
fade Length" value) of the waveform immediately before the
beginning of the loop is taken and mixed with the end portion.
At this time, the waveform level of the portion immediately
before the end (the length specified by "Crossfade Length") will
gradually decrease, and the waveform level immediately before
the beginning of the loop will gradually increase as the two are
mixed.
When the "Loop On" parameter is checked, and the "Start" and
"Loop S. " parameters have different values, the "Crossfde" button
becomes available.
Sampling 239
Sample Edit > Loop Edit