Crossfade And Volume Adjust Curves; The Keymap Editor - Kurzweil K2661 Musician's Manual

Sampling and Sample Editing

The Keymap Editor

Here's an example. Suppose you set Thresh, Comp, and Time as shown in the preceding
diagram. Beginning from the Start point, when the signal first reaches the threshold, the
Dynamics function begins compressing the signal, attenuating every point above the threshold
by 50%. Compression continues until the signal goes back below the threshold. At that point, the
compression starts diminishing, and ramps back to zero in 0.3 seconds. If the signal goes above
the threshold again within the selected segment, this process repeats.

Crossfade and Volume Adjust Curves

There are five curves that can be applied to a number of DSP functions: LIN, EXP, COS, EQL,
and MIX. The LIN curve is a straight linear curve, which will create an even cut or boost. The
EXP curve is exponential, that is, gradual at one end and steep at the other. The COS curve is a
segment of a cosine curve, which is relatively steep at both ends and flatter in the middle. The
EQL curve steepens at an even rate, approximating an equal-power fade curve. The MIX curve
is a gradual curve that approximates manually dropping or raising the faders on a mix board.
The diagram below shows each of the curves as it would be applied to a cut in amplitude.
The Keymap Editor
The Keymap Editor lets you customize the K2661's factory preset keymaps and save them to
RAM. You can also build your own keymaps from scratch.
Keymaps are an integral part of every layer of a program. Each keymap contains a set of
parameters determining which sample(s) the K2661 will play when you trigger a note. Each
layer has at least one keymap, but it can have two keymaps when you're working with stereo
samples. Each of these stereo keymaps uses two of the 48 available voices.
Each keymap consists of a set of key (note) ranges—C 4 to G 4, for example. The entire span of
each keymap is from C 0 to G 10. Each range has a sample root assigned within the range. Each
sample root is a distinct ROM or RAM sample. Within each key range, the sample root is
transposed up and down to play on each of the range's notes. You can view each range by
changing the value of the Key Range parameter on the Keymap-editor page. You can mix
samples of different timbres within a single keymap, and even tune individual keys to any pitch
by defining key ranges to single notes and assigning samples to each of those notes.
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