Tempo Flag Fields - Lexicon PCM 80 - MIDI IMPLEMENTATION DETAILS Midi Implementation Manual

Lexicon
Seq Bits
64 8
65 7
66 7
67 7
68 7
69 7
70 1
71 12
72 3
73 7
74 7
75 9
76 9
77 2
78 9
79 9
80 1
81 12
82 7
83 2
84 1
85 12
86 7
87 2

Tempo Flag Fields

Near the top of the list you will find the Rvb Time Pre Delay field. Note that it is preceded by a <Tempo
Flag> indicator bit field. If the value of that indicator bit is 0, then contents of the 10-bit field set aside for
the Rvb Time Pre Delay value will control the time of the desired delay for that parameter. If the <Tempo
Flag> field was a 1, the contents of the 10-bit field for Rvb Time Pre Delay would contain tempo information
indicating the echoes/beat ratio to be used (in combination with the actual tempo) to calculate the delay
time for that parameter.
The Rvb Time Pre Delay field also illustrates a subtlety in the bit size of these fields. It was stated earlier
that PCM 80 effect control data fields are words from 1-16 bits in length utilizing the minimum number for
bits necessary to represent the full range of the field. If the range of Pre Delay is 0-465, which can be
represented in 9 bits, why are there 10 bits set aside for this parameter? It is precisely because of tempo
that 10 bits are reserved. The tempo information fits into 10 bits. The most significant 5 bits contain the
echoes count, 1-24 (0x18), and the least significant 5 bits contain the beat count, also 1-24 (0x18). All
parameters that can be assigned in tempo form will have a minimum count of 10 bits reserved, regardless
of the range of the parameter in standard form.
Dest Dest
List ID Number
0 53
0 54
0 55
0 56
0 57
0 58
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
1 11
1 12
1 13
1 14
PCM 80 MIDI Implementation Details
Range Field
200 Feedback
100 Panning
100 Panning
100 Panning
100 Panning
100 Panning
1 <Tempo Flag>
2500 MOD:LFO
5 MOD:LFO
98 MOD:LFO
100 MOD:LFO
500 MOD:AR Env
500 MOD:AR Env
3 MOD:AR Env
500 MOD:Env L
500 MOD:Env R
1 <Tempo Flag>
2500 MOD:Sw 1
98 MOD:Sw 1
2 MOD:Sw 1
1 <Tempo Flag>
2500 MOD:Sw 2
98 MOD:Sw 2
2 MOD:Sw 2
Voice4
Master
Voice1
Voice2
Voice3
Voice4
Rate
Shape
P Width
Depth
Attack
Release
Mode
Release
Release
Rate
P Width
Mode
Rate
P Width
Mode
23