Lexicon PCM 80 - MIDI IMPLEMENTATION DETAILS Midi Implementation Manual page 30

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Patching a long delay time parameter to Tempo
We want to patch to the DelayTime Voice1 again. The Tempo Flag field bit preceding the DelayTime
Voice1 parameter field in the Patchable Parameter Information list is assigned a 1 to indicate that the
parameter is in Tempo form. Down in the patching we put a 0 in the Destination Patchable Parameter List
ID, and a 49 (0x31) in the Destination Patchable Parameter Number. We want two points again, so we
put a 2 in the Count of Patch Points.
The Patch Information Block should be completed with the following 4 fields.
STOP RIGHT THERE. Look at the count of bits on those four parameters. Notice that instead of putting
16 bits (the maximum number of bits for the DelayTime Voice1 Parameter in the Glide>Hall algorithm),
we only put TEN bits. This is intentional, and is the reason these four examples are so explicit.
When the Tempo Flag field bit is assigned to 1 for a parameter, and the parameter is the destination of
a patch, the bit count for the parameter in the patching block is always 10 bits, even though the bit count
back in the Patchable Parameter Information may have been greater than 10 bits, as in this example.
Finishing off this example...
We want to patch a source point value of 0 to 10 echoes/3 beats and a source point value of 127 to 3
echoes/10 beats.
The first 7-bit field will contain a 0 to indicate point value 0. The first 10-bit field will contain an 0x143 to
indicate 10 echoes/3 beats. (10 decimal=01010 binary, 3 decimal=00011 binary. 0101000011
binary=0x143 hex.) The second 7-bit field will contain 0x7f to indicate point value 127. The second 10-
bit field will contain 0x0a4 to indicate 5 echoes/4 beats. (0001101010 binary=0x06a hex.)
Bits Contents
7 First Patch Point Value (0 through 127)
10 First Destination Patchable Parameter Value
7 Second Patch Point Value (0 through 127)
10 Second Destination Patchable Parameter Value
PCM 80 MIDI Implementation Details
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