root/trunk/libffado/doc/motu_firewire_protocol-mk3.txt

Revision 1835, 20.8 kB (checked in by jwoithe, 14 years ago)

MOTU:

  • Implement optical mode control for G3/Mk3 devices. This is currently untested.
  • Fix bug from r1834 which broke streaming for all non-G3 MOTU devices (the wrong MOTU_PA_MK3_OPT_* value was used to force the port B test in addDirPorts() and getEventSize() to True for these devices).
  • Allow MOTU registers to be optionally absolute rather than relative to a notional base address. This is needed to accommodate some G3 registers which do not share the same base address as traditional MOTU registers.
  • Update G3 protocol document to include input and output control of optical port modes.
  • Note that streaming for non-G3 devices was broken by r1831 (optical_mode was used uninitialised to set flags). This was implicitly fixed by changes in r1834, but as noted above r1834 introduced a new bug which kept G1/G2 streaming broken until now.
Line 
1 Protocol details for MOTU "mark 3" devices, obtained in the first instance
2 using an 828 Mk 3.
3
4 Version: 20100517-1
5 Author: Jonathan Woithe
6
7
8 Audio data streaming packets
9 ----------------------------
10
11 It appears the streaming packets in the "mark 3" devices use a very similar
12 protocol to the earlier interfaces.  Each iso packet begins with a 64-bit
13 CIP header.  Following this are N data blocks, where N varies according to
14 the sample rate selected (8 for 1x, 16 for 2x, 32 for 4x).  Each data block
15 comprises a 32-bit SPH field (consisting of a standard SPH timestamp), 48
16 bits of control/MIDI data and then the audio data itself.  The audio data is
17 sent as packed big-endian signed integer data, as for the earlier
18 interfaces.
19
20 At 1x rates, the maximum packet size sent to the MOTU is 0x328 (808) bytes:
21   8 bytes CIP header
22   8 data blocks
23 Each data block contains:
24   4 bytes SPH timestamp
25   6 bytes control/MIDI data
26   90 bytes of audio data (30 channels)
27 The audio data is ordered as follows: phones, analog 1-8, main out, SPDIF,
28 ADAT1 1-8, ADAT2 1-8.
29
30 At 1x rates the MOTU sends 0x388 (904) bytes per packet, providing space
31 for 34 audio channels (order to be investigated): mic/guitar 1-2, analog
32 1-8, return 1-2, reverb 1-2, SPDIF, Unknown 1-2, ADAT1 1-8, ADAT2 1-8.
33
34 At 2x rates, packets sent to the MOTU have a maximum size of 0x4c8 (1224)
35 bytes while those sent by the MOTU are 0x0588 (1416) bytes.  16 blocks are
36 send in each packet.  22 channels sent to the MOTU (order to be confirmed):
37 phones, analog 1-8, main out, SPDIF, ADAT1 1-4, ADAT2 1-4.  There is space
38 for 26 channels sent from the MOTU (order to be investigated): analog 1-8,
39 mic/guitar 1-2, SPDIF, return 1-2, reverb 1-2?, ADAT1 1-4, ADAT2 1-4,
40 unknown 1-2.
41
42 At 4x rates 0x0508 (1288) bytes are sent to the MOTU and 0x0688 (1672) are
43 sent from the MOTU.  For sending to the MOTU there are 32 blocks with room
44 for 10 audio channels: unknown 1-2, analog 1-8.  The MOTU sends 14 audio
45 channels (order to be investigated): analog 1-8, mic/guitar 1-2, return 1-2,
46 unknown 1-2.
47
48 The following matrix represents the current best guess as to the layout of
49 the audio channels in the iso data.  Offset refers to the number of bytes
50 from the start of the data block.  "?" signifies that the channel assignment
51 is yet to be confirmed and/or is positioned as a result of educated
52 guesswork.
53
54 Offset       1x Rates              2x Rates              4x Rates
55        Playback   Capture    Playback   Capture    Playback   Capture
56 -------------------------------------------------------------------------
57 10     Phones-L   Mic-1?     Phones-L   Mic-1?     Unknown-1  Mic-1? 
58 13     Phones-R   Mic-2?     Phones-R   Mic-2?     Unknown-2  Mic-2? 
59 16     Analog 1   Analog 1   Analog 1   Analog 1   Analog 1   Analog 1
60 19     Analog 2   Analog 2   Analog 2   Analog 2   Analog 2   Analog 2
61 22     Analog 3   Analog 3   Analog 3   Analog 3   Analog 3   Analog 3
62 25     Analog 4   Analog 4   Analog 4   Analog 4   Analog 4   Analog 4
63 28     Analog 5   Analog 5   Analog 5   Analog 5   Analog 5   Analog 5   
64 31     Analog 6   Analog 6   Analog 6   Analog 6   Analog 6   Analog 6
65 34     Analog 7   Analog 7   Analog 7   Analog 7   Analog 7   Analog 7
66 37     Analog 8   Analog 8   Analog 8   Analog 8   Analog 8   Analog 8
67 40     MainOut-L  Return-1?  MainOut-L  Return-1?             Return-1?
68 43     MainOut-R  Return-2?  MainOut-R  Return-2?             Return-2?
69 46     SPDIF-1    SPDIF-1?   SPDIF-1?   SPDIF-1?              Unknown-1
70 49     SPDIF-2    SPDIF-2?   SPDIF-2?   SPDIF-2?              Unknown-2
71 52     ADAT1-1    Reverb-1?  ADAT1-1?   Reverb-1?
72 55     ADAT1-2    Reverb-2?  ADAT1-2?   Reverb-2?
73 58     ADAT1-3    Unknown-1? ADAT1-3?   ADAT1-1?
74 61     ADAT1-4    Unknown-2? ADAT1-4?   ADAT1-2?
75 64     ADAT1-5    ADAT1-1?   ADAT2-1?   ADAT1-3?
76 67     ADAT1-6    ADAT1-2?   ADAT2-2?   ADAT1-4?
77 70     ADAT1-7    ADAT1-3?   ADAT2-3?   ADAT2-1?
78 73     ADAT1-8    ADAT1-4?   ADAT2-4?   ADAT2-2?
79 76     ADAT2-1    ADAT1-5?              ADAT2-3?
80 79     ADAT2-2    ADAT1-6?              ADAT2-4?
81 82     ADAT2-3    ADAT1-7?              Unknown-1?
82 85     ADAT2-4    ADAT1-8?              Unknown-2?
83 88     ADAT2-5    ADAT2-1?
84 91     ADAT2-6    ADAT2-2?
85 94     ADAT2-7    ADAT2-3?
86 97     ADAT2-8    ADAT2-4?
87 100               ADAT2-5?
88 103               ADAT2-6?
89 106               ADAT2-7?
90 109               ADAT2-8?
91 ------------------------------------------------------------------------ 
92 #ch    30         34         22         26         10         14
93
94 When an optical port is configured in Toslink mode, the two Toslink channels
95 take the place of that port's 8 ADAT channels in the data stream.  That is,
96 ADAT-x 1-8 are removed and in their place Toslink-A 1-2 are added.  So in
97 the case of 1x playback, the Toslink channels appear at offset 52, with
98 ADAT-B's channels commencing at offset 58 (the total packet size in this
99 case being 0x02c8 bytes).
100
101 Unlike previous MOTU generations, the Toslink outputs in the Mark 3 devices
102 are present as channels in their own right - they do not mirror the SPDIF
103 channel.
104
105
106 Device control
107 --------------
108
109 Optical port modes
110
111 The modes of the two optical ports can be controlled independently.  The
112 primary mechanism for this is via a quadlet write to register
113 0xfffff0000c94.
114
115   Bit 22: optical port B output mode (0=ADAT, 1=Toslink)
116   Bit 20: optical port B input mode (0=ADAT, 1=Toslink)
117   Bit 18: optical port A output mode (0=ADAT, 1=Toslink)
118   Bit 16: optical port A input mode (0=ADAT, 1=Toslink)
119   Bit  9: optical port B output enabled (0=disabled, 1=enabled)
120   Bit  8: optical port A output enabled (0=disabled, 1=enabled)
121   Bit  1: optical port B input enabled (0=disabled, 1=enabled)
122   Bit  0: optical port A input enabled (0=disabled, 1=enabled)
123
124 Other areas of the driver also appear to refresh the device status with
125 writes to other registers at the time the optical mode is updated:
126   0xfffff0000c04
127   0xfffff0000c60 - 0xfffff0000c6c (ASCII name of clock source)
128   0xfffff0000c94
129   0xfffff0000b14
130   0xfffff0000b38
131   0xfffff0000b3c
132   0xfffff0000b04
133   0xfffff0000b08
134   0xfffff0000b38
135   0xfffff0000b3c
136   0xfffff0000b1c
137 It is not known whether these additional writes are necessary.
138
139
140 Clock source control and sample rate
141
142 The clock source is set with a quadlet write to bits 0, 1, 3 and 4 of
143 register 0xfffff0000b14.  Values for bits 4-3-1-0:
144   0-0-0-0 = internal
145   0-0-1-0 = SMTPE
146   0-0-0-1 = Word clock
147   1-0-0-0 = SPDIF
148   1-1-0-0 = ADAT port A / Toslink-A (depending on current optical port mode)
149   1-1-0-1 = ADAT port B / Toslink-B (depending on current optical port mode)
150
151 The sample rate is selected using bits 10-8 of register 0xfffff0000b14:
152   0x0 = 44.1 kHz
153   0x1 = 48 kHz
154   0x2 = 88.2 kHz
155   0x3 = 96 kHz
156   0x4 = 176.4 kHz
157   0x5 = 192 kHz
158
159 Bits 25 and 24 of register 0xfffff0000b14 are used in connection with
160 streaming control (see separate section).  All other bits not mentioned
161 are set to zero.
162
163 Writes to other registers (as for ADAT modes) accompany the setting of
164 register 0xfffff0000b14.
165
166
167 MainOut/Phones assign
168
169 Register 0xfffff0000c04 controls the MainOut assign via bits 7-4:
170   0x0 = MainOut
171   0x1 = Ana 1-2
172   0x2 = Ana 3-4
173   0x3 = Ana 5-6
174   0x4 = Ana 7-8
175   0x5 = SPDIF
176   0x6 = Phones
177   0x7 = ADAT-A 1-2 (or Toslink if ADAT-A optical out mode is Toslink)
178   0x8 = ADAT-A 3-4
179   0x9 = ADAT-A 5-6
180   0xa = ADAT-A 7-8
181   0xb = ADAT-B 1-2 (or Toslink if ADAT-B optical out mode is Toslink)
182   0xc = ADAT-B 3-4
183   0xd = ADAT-B 5-6
184   0xe = ADAT-B 7-8
185
186 Bits 3-0 of register 0xfffff0000c04 control the Phones assign.  The meaning
187 of the bit combinations is as per the MainOut assign case.
188
189 Bits 11-8 of register 0xfffff0000c04 control the "Return" assign.  Again,
190 the meaning of the bit combinations is as per the MainOut assign case.
191
192 All other bits in register 0xfffff0000c04 appear to be zero at present.
193
194
195 Streaming control
196
197 Bits 31 to 16 of register 0xfffff0000b00 control the streaming channels
198 in the same way as for earlier MOTU devices.
199
200 To start streaming:
201  - a value of 0x00000002 is written to register 0xfffff0000b10.
202  - bit 24 of register 0xfffff0000b14 is set to 1 (other bits are set to
203    their current values)
204  - a bunch of other registers are written to which, given experience with
205    earlier MOTU interfaces, are not strictly required
206  - register 0xfffff0000c04 is polled.  A result of 0x00000111 requires
207    another poll.  Polling stops when the value is 0x00000303.
208  - register 0xfffff0000b14 is read.
209  - bits 24 and 25 in register 0xfffff0000b14 are set (other bits remain
210    unchanged)
211  - another bunch of (possibly inconsequential) registers is written to.
212  - register 0xfffff0000b14 is read again.
213  - writes to the same collection of registers again.
214
215 To stop streaming:
216  - bit 25 of register 0xfffff0000b14 is cleared (other bits remain
217    unchanged; this includes leaving bit 24 set to 1)
218  - register 0xfffff0000b00 is used to stop streaming in the same way as for
219    earlier MOTU interfaces
220  - write to other registers of potentially little value
221  - register 0xfffff0000b14 has bit 24 cleared (all other bits remain
222    unchanged, so bits 25 and 24 are both zero)
223  - immediately, register 0xfffff0000b14 has bit 24 set (all other bits
224    remain unchanged).
225  - other registers are read again.
226
227 It appears based on this that the streaming control of the Mark3 MOTU
228 devices is the same as for previous generations.
229
230
231 CuemixFX control
232 ----------------
233
234 Control of the CuemixFX system is via writes starting at register
235 0xffff00010000.  Either 1, 2 or 3 quadlets are written depending on what is
236 being done.  Each packet includes a serial number which is incremented after
237 sending each control packet.  The same serial number counter is used
238 regardless of the type of control packet being sent.
239
240
241 CuemixFX heartbeats
242 -------------------
243
244 The MOTU periodically sends a heartbeat packet back to the PC.  This is sent
245 to address 0x000300000000 and consists of a single quadlet length write
246 block request of the following form:
247
248   00 aa 00 00
249
250 "aa" is the serial number ranging from 0x00 to 0xff.
251
252 It appears that heartbeat packets are sometimes sent to the MOTU.  These take
253 the form of single-quadlet writes to the CuemixFX address.  The quadlet
254 takes the following form:
255
256   02 aa 00 00
257
258 "aa" is the serial number of the packet ranging from 0x00 to 0xff.
259
260 It's not yet certain what purpose these packets serve and whether they are
261 in fact necessary.  It is also not yet known whether the MOTU or the PC
262 initiates the process (that is, which one sends a packet with a given serial
263 number first).
264
265
266 Pedal events
267 ------------
268
269 When a pedal event occurs the MOTU sends a quadlet write request to address
270 0x000300000000 on the PC.  The format of the quadlet is as follows.
271
272   bb 00 00 c2
273
274 "bb" is 0 for a "pedal up" event and 1 for a "pedal down" event.  The pedal
275 is "down" when the pedal switch is closed.
276
277
278 CuemixFX variable controls
279 --------------------------
280
281 The control of continuously variable controls (for example, faders, pan
282 controls) is by way of 3-quadlet writes to the CuemixFX register.  The
283 format of these writes is as follows:
284
285   02 aa 66 bb - cc dd ee v1 - v2 v3 v4 00
286
287 where:
288   aa = packet serial number as previously described
289   bb = the bus/channel number (0x00 = mix bus 1, mic 1)
290   cc-dd-ee = the key of the control being changed
291   v1-v4 = the value being written.  v1 is the most-significant byte.  The
292           value appears to be a 32-bit float.  That is, v1..v4 is a big
293           endian 32-bit float.
294
295 Keys presently identified are as follows.
296
297   00-01-02 = Bus reverb send (0-0x3f800000)
298   00-0c-01 = Input reverb send (0 ("-inf") to 0x3f800000 ("0 dB")).  bb is
299              the zero-based input channel index for this key.
300   01-01-02 = Bus reverb return (0-0x3f800000)
301   02-00-01 = Input trim control (mic inputs: 0 ("+0 dB") - 0x42540000 ("+53
302              dB"); line inputs: 0xc2c00000 ("-96") - 0x41b00000 ("+22")).
303              For this key, bb is the zero-based channel index.
304   02-00-02 = Bus master fader
305   02-mm-02 = Channel pan.  mm is the standard channel index.  Values range
306              from 0xbf800000 (L) to 0x3f800000 (R).
307   03-mm-02 = Channel fader.  mm is the channel index starting at 0x02 for
308              the first channel (on the 828-mk3 this is mic 1).  Values range
309              from 0 (-inf) to 0x3f800000 (0 dB).
310   05-mm-02 = Channel balance (active only for stereo paired channels).
311              Values are from 0xbf800000 ("-1") to 0x3f800000 ("1").
312   06-mm-02 = Channel width (active only for MS-paired channels).  Values are
313              from 0 ("0") to 0x3f800000 ("1").
314   07-00-00 = Focus select.  v4 = 0x01 for channel select, 0x03 for bus
315              select.  For channel select one is focusing the actual input,
316              not the channel in the current bus.  Therefore the bus select
317              byte (bb) is always zero for this key. v1 = 0x00 (mic 1 or 2),
318              0x01 (ana 1 or 2) and so forth for channel pairs.  Bus focus
319              focuses the output assigned to the bus, not the bus itself.  v1
320              in this case is 0x00 for Main, 0x01 for Analog 1-2 and so
321              forth.  Again the bus select byte is always zero.
322              v2 and v3 are always zero.
323
324 Channel EQ controls:
325   02-yy-01 = Input EQ frequency.  Value range 0x41a00001 (20 Hz) to
326              0x469c4004 (20 kHz)
327   03-yy-01 = Input EQ gain.  Value range 0xc1a00000 (-20 dB) to 0x41a00000
328              (+20 dB)
329   04-yy-01 = Input EQ Q.  Value range 0x3c23d70a (0.01) to 0x40400000 (3.00)
330   02-yy-03 = Output EQ frequency.  Value range 0x41a00001 (20 Hz) to
331              0x469c4004 (20 kHz)
332   03-yy-03 = Output EQ gain.  Value range 0xc1a00000 (-20 dB) to 0x41a00000
333              (+20 dB)
334   04-yy-03 = Output EQ Q.  Value range 0x3c23d70a (0.01) to 0x40400000 (3.00)
335 The EQ number ("yy" in this table) is as follows:
336   02 = EQ F
337   03 = EQ A
338   04 = EQ C
339   05 = EQ D
340   06 = EQ E
341   07 = EQ B
342   80 = EQ G
343
344 Input channel dynamics controls:
345   01-0a-01 = compressor threshold.  Value range 0xc2400000 (-48 dB) to
346              0x00000000 (0 dB).
347   02-0a-01 = compressor ratio.  Value range 0x3f800000 (1.0:1) to
348              0x41200000 (10.0:1).
349   03-0a-01 = compressor attack.  Value range 0x41200000 (10 ms) to
350              0x42c80000 (100 ms)
351   04-0a-01 = compressor release.  Value range 0x41200000 (10 ms) to
352              0x44fa0000 (2 s)
353   05-0a-01 = compressor trim.  Value range 0xc0c00000 (-6 dB) to
354              0x00000000 (0 dB)
355   02-0b-01 = leveler makeup gain.  Value range 0x00000000 to 0x42c80000.
356   03-0b-01 = leveler gain reduction.  Value range 0x00000000 to 0x42c80000.
357
358 Output channel dynamics controls:
359   01-09-03 = compressor threshold.  Value range 0xc2400000 (-48 dB) to
360              0x00000000 (0 dB).
361   02-09-03 = compressor ratio.  Value range 0x3f800000 (1.0:1) to
362              0x41200000 (10.0:1).
363   03-09-03 = compressor attack.  Value range 0x41200000 (10 ms) to
364              0x42c80000 (100 ms)
365   04-09-03 = compressor release.  Value range 0x41200000 (10 ms) to
366              0x44fa0000 (2 s)
367   05-09-03 = compressor trim.  Value range 0xc0c00000 (-6 dB) to
368              0x00000000 (0 dB)
369   02-0a-03 = leveler makeup gain.  Value range 0x00000000 to 0x42c80000.
370   03-0a-03 = leveler gain reduction.  Value range 0x00000000 to 0x42c80000.
371
372 Channel index values (mm in the above tables) are as follows on the 828 Mk3.
373
374   0x02 = mic 1
375   0x03 = mic 2
376   0x04 - 0x0b = analog 1-8
377   0x0c - 0x0d = SPDIF 1 and 2
378   0x0e - 0x15 = ADAT A 1-8
379   0x16 - 0x1c = ADAT B 1-8
380
381 If a channel pair is flagged as a stereo pair then only the first control
382 register is written to.
383
384 Reverb parameters:
385   02-00-04 = predelay. 0x00000000 (0 ms) to 0x42c80000 (100 ms).
386   03-00-04 = shelf filter frequency.  0x447a0000 (1 kHz) to 0x469c4000 (20
387              kHz).
388   04-00-04 = shelf filter cut.  0xc2200000 (-40 dB) to 0x00000000 (0 dB).
389   05-00-04 = reverb time.  0x42c80000 (100 ms) to 0x476a6000 (60 sec).
390   06-00-04 = reverb design: low time.  0x00000000 (0%) to 0x42c80000 (100%).
391   07-00-04 = reverb design: mid time.  0x00000000 (0%) to 0x42c80000 (100%).
392   08-00-04 = reverb design: high time.  0x00000000 (0%) to 0x42c80000
393              (100%).
394   09-00-04 = reverb design: crossover low.  0x42c80000 (100 Hz) to
395              0x469c4004 (20 kHz).
396   0a-00-04 = reverb design: crossover high.  0x447a0000 (1 kHz) to
397              0x469c4004 (20 kHz).
398   0b-00-04 = reverb design: width.  0xbf800000 (-100%) to 0x3f800000
399              (+100%).
400   0d-00-04 = early reflections size.  0x42480000 (50%) to 0x43c64000 (400%).
401   0e-00-04 = early reflections level.  0x00000000 (-inf) to 0x3f800000 (0
402              dB).
403
404
405 CuemixFX switches
406 -----------------
407
408 Switches and discrete controls in CuemixFX are controlled through a
409 2-quadlet write to the CuemixFX register.  The format of this is
410
411   02 aa 69 v1 - bb k1 k2 k3
412
413 where:
414   aa = packet serial number
415   bb = bus/channel index (0x00 = mix bus 1 or mic 1, depending on the control)
416   v1 = the value of the switch / discrete control
417   k1-k2-k3 = the key of the control being set
418
419 Depending on the control, the channel number being set is communicated
420 either as part of the key (for controls which operate on a per-mixbus basis)
421 or in the "bb" field of the packet (for controls which operate on a
422 per-input/output basis.
423
424 The keys appear to be rather structured.  The value of k3 appears to
425 indicate what kind of object the key applies to:
426
427   00 = global resource (eg: talkback)
428   01 = input channel (corresponding to a physical device input)
429   02 = a channel in a bus mix
430   03 = output channel (corresponding to a physical device output)
431   04 = global configuration
432
433 Keys presently identified:
434   00-00-01 = Input channel phase.  Value is 0x00 (normal), 0x01 (invert)
435              bb is the input channel index (0 is mic 1).  When two adjacent
436              channels are paired the phase of each can still be independently
437              controlled.  FIXME: also under the 00-cc-01 entry.
438   00-00-02 = bus output assignment.  Values are:
439               0xff = disabled
440               0x00 = main L-R
441               0x01-0x04 = Analog 1-2 though 7-8
442               0x05 = SPDIF 1-2
443               0x06 = Phones L-R
444               0x07-0x0a = ADAT A 1-2 through 7-8
445               0x0b-0x0e = ADAT B 1-2 through 7-8
446   00-03-00 = talkback channel select.  The value is the 0-based channel index
447              of the talkback channel.
448   00-cc-01 = input channel EQ/dynamics switches.  Value is 0x00 (off) or 0x01
449              (on).  cc values identified to date:
450                00 = phase (0x00 normal, 0x01 invert)
451                02 = EQ F enable
452                03 = EQ A enable
453                04 = EQ C enable
454                05 = EQ D enable
455                06 = EQ E enable
456                07 = EQ B enable
457                08 = EQ G enable
458                0a = Compressor enable
459                0b = Leveler enable
460              FIXME: work out some way to identify the EQs.
461   00-cc-03 = output channel EQ/dynamics switches.  Value is 0x00 (off) or
462              0x01 (on).  cc values identified to date:
463                01 = EQ F enable
464                02 = EQ A enable
465                03 = EQ C enable
466                04 = EQ D enable
467                05 = EQ E enable
468                06 = EQ B enable
469                07 = EQ G enable
470                09 = Compressor enable
471                0a = Leveler enable
472   00-04-00 = talkback listen channel select.  The value is the 0-based
473              channel index of the talkback listen channel.
474   00-mm-02 = mix channel mute.  mm is the channel index as for other keys.
475              Value is 0x00 (off) or 0x01 (on).
476   00-01-02 = bus mute.  Values are 0x00 (off), 0x01 (on).
477   00-0c-03 = output channel monitor enable (0x00=off, 0x01=on)
478   01-00-01 = input channel mono/stereo mode.  Value is 0x00 (mono), 0x01
479              (stereo).  bb (bus select byte) is always zero for this key
480              since this acts globally on the input.
481   01-00-04 = Reverb split point.  Value is 0x00 for "mixes", 0x01 for
482              "outputs".
483   01-mm-02 = mix channel solo.  mm is as for the mute control.  Value is
484              0x00 (off) or 0x01 (on).
485   01-0a-03 = output channel leveler mode (0x00=compress, 0x01=limit)
486   01-0c-03 = output channel talkback talk (0x00=off, 0x01=on)
487   02-0c-03 = output channel talkback listen (0x00=off, 0x01=on)
488   03-00-01 = input channel swap L and R.  Value is 0x00 (no swap), 0x01
489              (swap).  bb is the input channel index.
490   04-00-01 = input channel stereo mode.  Value is 0x00 for normal stereo,
491              0x01 for MS.  Relevant only if input channel is in stereo mode
492              (and thus part of a stereo pair).
493   06-00-01 = input channel Vlimit on (mic channels only).  Values are 0x00
494              (off), 0x01 (on).
495   06-0a-01 = input channel compressor mode (0x00=peak, 0x01=RMS)
496   06-0b-01 = input channel leveler mode (0x00=compress, 0x01=limit)
497   06-09-03 = output channel compressor mode (0x00=peak, 0x01=RMS)
498   07-00-01 = input channel Vlimit lookahead (mic channels only).  Values are
499              0x00 (off), 0x01 (on).
500   08-00-01 = input channel soft clip (mic channels only).  Values are 0x00
501              (off), 0x01 (on).
502   0c-00-04 = Reverb early reflections model.  Value is 0x00-0x04 for "Room
503              A" through to "Room E".  bb is zero.
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