Portamento Rate; Attack Portamento; Globals - Kurzweil K2661 Musician's Manual

Program Mode and the Program Editor
The COMMON Page
When you're applying large amounts of portamento to multi-sampled sounds (Acoustic Guitar,
for example), the K2661 will play more than one sample root as the pitch glides from the starting
pitch to the ending pitch. This may cause a small click at each sample root transition. You can
reduce the number of clicks you'll hear by entering the Program Editor and adjusting the
KeyTrk parameter on both the KEYMAP and PITCH pages. The quickest way is to set the
KeyTrk value on the KEYMAP page to 0, and to 100 on the PITCH page. This will stretch the
sample root that plays at C 4 across the entire keyboard. Now any amount of portamento will
play only one sample root, and the clicks will disappear.
There's a tradeoff here, since many sounds will change in timbre as these single sample roots are
pitch-shifted during the portamento. This will be most noticeable for acoustic instrument
sounds, and may not be noticeable at all for single-cycle waveforms like sawtooth waves.
Furthermore, some samples will not glide all the way up to the highest notes—there's a limit to
the amount of upward pitch-shifting that can be applied to samples. If this doesn't work for you,
you can compromise between the number of clicks and the amount of timbre change by further
adjusting the KeyTrk parameters on the KEYMAP and PITCH pages.
As long as the combined values of the KeyTrk parameters on both pages add up to 100, you'll
have normal semitone intervals between keys. If you set both parameters to values of 50, for
example, the sound will still play normally, and you'll have several sample roots (about half the
number of the original sound) stretched evenly across the keyboard, instead of just one. This
will give you fewer clicks than in the original sound, but not as much change in timbre as setting
the KEYMAP KeyTrk value all the way to 0. Set the KEYMAP KeyTrk parameter higher to
reduce the change in timbre, or set the PITCH KeyTrk value higher to reduce the number of
clicks. Just make sure the combined values add up to 100, to preserve the normal intervals
between notes.

Portamento Rate

The setting for Portamento rate determines how fast the current note glides from starting pitch
to ending pitch. The value of this parameter tells you how many seconds the note takes to glide
one semitone toward the ending pitch. At a setting of 12 keys/second, for example, the pitch
would glide an octave every second. The list of values is nonlinear; that is, the increments get
larger as you scroll to higher values.

Attack Portamento

This parameter toggles between two types of portamento. When set to On, the K2661
remembers the starting pitch so you don't have to hold a note on to achieve portamento. The
pitch always glides to each new note from the previously triggered note. When set to Off, the
pitch will glide to the most recently triggered note only when the previous note is still on (in
other words, you must use legato fingering).

Globals

This is another toggle, which affects LFO2, ASR2, FUNs 2 and 4, and program output routing to
KDFX. When off, these four control sources are local; they affect each individual note in the
layers that use them as a control source. They begin operating each time a note in that layer is
triggered.
When the Globals parameter is set to On, these control sources become global, that is they affect
every note in every layer of the current program, not just the one to which they're applied.
When these control sources are global, they begin operating as soon as the program is selected.
When Globals are on, LFO2, ASR2, and FUNs 2 and 4 will appear on their respective pages
preceded by the letter G to indicate that they're global.
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