E-Mu ESI-32 - Digital Tools I

Digital Processing 123
If you have a difficult time finding good loop points, the ESI-32 can
assist you with 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 Submodule 2.
LOOP secs samples
Start: 1.96 43280
End: 3.54 78162
Size: 1.58 34882
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 will automatically change the end point, so that
the difference in samples between the start and end points remains
equal to the size.
• Changing the start point will change the end point to maintain a
constant size.
• Changing the end point changes the size, and the start point remains
constant.
4. The display will inquire 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 secs samples
Start: 1.96 43280
End: 3.54 78162
Auto Correlate? Y/N
With Auto Correlation, the ESI-32 looks for loop points near the ones
you chose that can be spliced together with minimum discontinuity.
Occasionally it will be impossible for either you or the ESI-32 to locate a
perfect splice point, but in most cases you’ll find that Auto Correlation,
combined with practice and experimentation, can produce very smooth
loops.
! 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.
2. Loop
! Caution: You cannot Undo the loop
settings.
✱
Tip: The smallest possible loop start
point is four samples into the sound.