Lexicon 300, Owner'S Manual

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4-29
The Algorithms and their Parameters
General Description
Mono Pitch Shift
The Mono Pitch Shift Algorithm has several useful effects, including predelay,
feedback, and glide. The pitch shifter in the 300 includes a pitch detection feature
which automatically adjusts the period of the splices to match the pitch of
incoming signals. This feature makes the splicing intelligent, and greatly reduces
the artifacts associated with pitch shift. the Mono Pitch Shift program, each
channel splices independently. It takes about 40 ms for the pitch detector to
obtain an optimal pitch value. Setting the DLY control to this value will give the
smoothest pitch shift. Shorter values can be used for special effects, or when
extra delay cannot be tolerated.
There are three interacting controls for pitch described below: Glide, Pitch
Interval, and Fine Pitch. Adjusting any pitch control activates a long display that
shows the pitch percentage, the musical interval, and any fine adjustment in
cents. Always use this long display when matching Glide to Pitch Interval and
Fine Pitch.
Mono Pitch Shift
Parameters
Mono Pitch Shift Adjustments
DM: PCH DLY FBK
-2Oct to M7+48¢ 0-510ms 0-98%, Max
MchB GLD FIN BNPS
-2Oct to M7+48¢ +96 cents On/Off
Effect Naming Page
Σ
Shifter
PITCH FINE GLIDE
Bandpass
Delay
Feedback
Mono Pitch Shift Adjustments Page
PCH adjusts pitch interval. The exact tuning can be altered by FIN, and the exact
pitch shift in intervals and cents is displayed. FIN must be set to the exact middle
of its range if perfect pitch intervals are to be obtained.
In the long display, fine pitch is shown by the number of cents added to, or
subtracted from, the semitone intervals. Remember that PITCH will produce
exact intervals only if FIN is centered. The rightmost character in the long display
is an asterisk (*) if FIN is centered, and a '+' or '-' otherwise. When the VALUE
key turns on the short value display, FIN is not shown in cents, but as a number
ranging from -32 to +32 in order to give a clear indication of how much the pitch
shift has been changed. When '**' is shown, FIN is centered and inactive. As a
rule, 1 count of FIN is worth 2 cents near 200%, 3 cents near 100%, 6 cents near
50%, and 12 cents near 25%.
PCH