Kurzweil K2661 Musician's Manual page 416

Sampling and Sample Editing
Editing Samples
Loop, and End parameters are different.) To the right of the dividing bar you see the entire loop
segment of the sample.
In the center of the loop segment is a dotted vertical bar that represents the loop transition
point—that is, the point at which the sample reaches its End point and loops back to the Loop
point. You can visualize the loop segment by starting at the vertical transition point; this is the
beginning of the loop, as defined by the setting for the Loop parameter. The waveform
progresses to the right, representing the initial portion of the loop segment. The waveform
"disappears" off the far right side of the display, and "reappears" at the thick dividing bar at the
center of the display. The waveform again progresses to the right, representing the final portion
of the loop segment. It reaches the dotted vertical transition line, representing the End point of
the sample, where it jumps once again to the loop point and repeats the cycle.
If you select the Loop (L) parameter and change its value, you'll see the segment of the
waveform to the right of the transition point shift its position. If you select the End parameter
and change its value, you'll see the segment of the waveform to the left of the transition point
shift its position.
When you're setting a loop segment for a sample, you'll want to adjust both the Loop and End
parameters so the two ends of the waveform meet (or come as close as possible) at the transition
point. You'll notice an audible click in your sample loop if the ends of the waveform do not meet
at the transition point. The closer you can get the two ends of the waveform, the better the sound
quality of your loop will be. With a bit of experimentation, you'll develop the ability to create
smooth loop transitions.
You'll also want to try to set the loop point at a zero-crossing—a point where the sample
waveform is neither positive or negative. Pressing the Plus/Minus buttons together will search
(from left to right) for the sample's next zero-crossing. You can usually press these buttons
several times for any given sample without noticeably affecting the sound of the sample. If you
press the Minus button, you'll reverse the direction of the search, and the next time you press
the Plus/Minus buttons together, the K2661 will search for the next zero-crossing to the left.
Press the Plus button again to search toward the right.
Note: The Gain affects the sensitivity of the zero-crossing search algorithm. The higher the gain, the
more zero crossings it will find. At low gain settings, the algorithm will fail to find many or even all zero
crossings.
If you adjust the display Gain and Zoom of the sample while on the LOOP page, you'll notice
that the Gain affects the waveform on both sides of the loop point, while the Zoom affects only
the left side of the page. You can't zoom in on the loop transition point in the right half of the
display.
You can also use the crossfade loop (XfadeLoop) DSP function to get a smooth transition
between loop points. As with the TRIM page, you'll recover memory after saving the sample
and exiting the Sample Editor.
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