Adjust Knob Initial Value; Patchable Parameter Information; Patching Information - Lexicon PCM 80 - MIDI IMPLEMENTATION DETAILS Midi Implementation Manual

PCM 80 MIDI Implementation Details

ADJUST Knob Initial Value

The ADJUST Knob Initial Value is a single 7-bit field which defines the value, 0-127, to which the ADJUST
knob will be assigned when the effect register is loaded. Please note that the initial value of the knob ought
to lie in the range defined by Controls ADJUST Low Limit and High Limit fields in the Unpatchable
Parameter Information.

Patchable Parameter Information

As stated earlier, the Patchable Parameter Information is different for every algorithm. The actual list of
fields for each algorithm is provided earlier in this document. To give you an idea of what you will find there,
the first six parameters in every algorithm looks like this:
Seq Bits
0 7
1 7
2 8
3 8
4 7
5 7
Look through the Edit Matrix picture for the algorithms in the PCM 80 User Guide, you will notice that the
sequence of these fields matches the order of the parameters found in the Edit Matrix, starting at Row 0
Slot 0 and going through the slots in Row 0. The Patchable Parameter Information is in fact derived from
the sequence of patchable parameters in the Edit Matrix. If you took the entire list of every parameter in
the Edit Matrix, then removed all the unpatchable parameters, the remaining list would be the patchable
parameters.

Patching Information

As the first Bitpacked Effect Control Data Group is the soft row information, which occupies the very
beginning of the Edit Matrix of the algorithms, followed by the unpatchable parameters, the ADJUST knob
value, and the patchable parameters (all of which draw from more and more of the Edit Matrix of the
algorithms), it is consistent that the last row of every Edit Matrix, the Patch row, finishes off the content
of the bitpack groups.
The Patching Information consists of 10 variable length blocks, one for each of the 10 patches in the Patch
row. Each block can be as small as 1 bit or as large as 204 bits (25 bytes, 4 bits).
A Patch Information Block always begins with a 1-bit field which indicates whether there is ANY patch
information for that patch. 0 means that there is no patch in that slot, 1 means that the data to follow is
to be interpreted as patch information. Therefore, an effect register which contains NO patches will have
a sequence of 10 zero-bits immediately after the Patchable Parameter Information in the bitpack
parameter data, each zero signifying an unassigned patch.
When the Patch Validity Value bit is a 1, it is immediately followed by the Patch Block Header with the
following format:
20
Range Field
100 Controls
80 Controls
160 Controls
160 Controls
100 Controls
100 Controls
Bits Contents
7 Patch Source ID Value
1 Destination Patchable Parameter List ID Value
8 Destination Patchable Parameter Number Value
4 Count of Patch Points Value
Mix
FX ADJUST
InLvl L
InLvl R
InPan L
InPan R
Lexicon