Lexicon LXP-15-II Owner's Manual page 82

Global patch parameter numbers 96-122 correspond to microcode parameter
numbers 0-26. Global patch parameter numbers 123 and 124 correspond to
parameter numbers 67 (Setup Increment) and 68 (Setup Decrement). If you
want to globally patch Foot Controller 1 to Input level (microcode parameter
number 24) you would use the global patch parameter number of 120 (96+24).
Its data value would be 72, corresponding to Foot Control 1 controller number.
The MIDI patch Offset values are generated internally by the equation:
Offset = [Source-Threshold] x Scale factor
where Source equals the value of the specified controller.
This calculated Offset value is added to the stored (base) value of the specified
destination parameter. The sum of the offset and base values is the number
used by the audio processor and the parameter transmit routines. The program-
mer should be aware that the offset values are internally updated whenever the
Source controller is changed — therefore if the programmer changes the offset
value externally it may be over-written shortly thereafter. The offset parameters
are most useful when read to determine the MIDI patch contribution to the
parameter values transmitted by the LXP-15 II.
Note: When the LXP-15 II receives a parameter change, the received value
is used as the new base parameter value. However, when the LXP-15 II
transmits a parameter value, this value equals the sum of the base parameter
value and any applicable MIDI patch offsets.
MIDI Implementation Data
7-7