Kurzweil K2500 - PERFORMANCE GUIDE REV F PART NUMBER 910251 CHAP 15 Sampling Manual page 19

Sampling and Sample Editing
Editing Samples
To the left of the dividing bar you see the same segment of the current sample that you see on
the TRIM page. The four vertical lines representing the Start (S), Alt (A), Loop (L), and End (E)
points are visible. (Remember, you'll see all four vertical lines only if the values for the Start,
Alt, 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 K2500 will search for the next zero-crossing to the left.
Press the Plus button again to search toward the right.
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.
DSP (RAM samples only)
Select the DSP page with the DSP soft button. This gives you access to a long list of non-real
time DSP functions, with which you can modify your RAM samples. The first time you select a
DSP function, you'll see the Normalize function, shown below. Afterward, the most recently
selected DSP function will appear when you select the DSP page.
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