Loop - ESI ESI2000 Operation Manual

2. Loop

Tip: The smallest possible loop start
point is four samples into the sound.
!
Caution: You cannot Undo the loop
settings.
!
Caution: If a sample's loop disappears as
soon as you have left the Digital Processing
module, check to see if the loop function has
been disabled in Dynamic Processing-1,
Setup.
Tip: If a sample ends in a loop, playing
it backwards will repeat the loop. The sample
will not play back prior to the loop start.
If you have a difficult time finding good loop points, the ESI can assist
you using the Auto Correlation function. If Auto Correlation doesn't
produce acceptable results, the beginning and end of a loop can be
crossfaded to help mask loop discontinuities. For more information, see
Background: About Looping at the beginning of this section.
1. Activate Digital Processing module.
2. Select the Loop submodule (2).
LOOP
Start: 1.96
End:
Size:
3. Select the values for the start point on line two and the loop size
on line four that give the best looping effect, then press ENTER.
The left and right cursor will change the start point and/or size so
that the loop automatically falls on positive zero crossing points in
the waveform.
The sample size equals the difference in samples between the start and
end points. These settings interact in the following ways:
• Changing the size automatically changes the end point so that the
difference in samples between the start and end points remains
equal to the size.
• Changing the start point changes the end point to maintain a
constant size.
• Changing the end point changes the size, and the start point remains
constant.
4. The display asks if you want to Auto Correlate. Press YES to Auto
Correlate, or NO to proceed directly to step six, Compress Loop.
Auto Correlation uses artificial intelligence techniques to choose
optimum loop points. Without Auto Correlation, unless you are
proficient with sampling techniques, loops will usually have
discontinuities between the splice points that can produce annoying
ticks, pops and other glitches.
LOOP
Start: 1.96
End:
Auto Correlate? Y/N
With Auto Correlation, the ESI looks for loop points, near the ones you
chose, that can be spliced together with minimum discontinuity. Occa-
sionally it will be impossible for either you or the ESI to locate a perfect
splice point which means the sound cannot be looped, but in most cases
you'll find that Auto Correlation, combined with practice and experi-
mentation, can produce very smooth loops.
secs samples
43280
3.54 78162
1.58 34882
secs samples
43280
3.54 78162
Digital Processing
123