Name matrix inputs, fix the meter scale, add output meters

Found on the live S31 (read-only, plus meter subscriptions):

- Matrix inputs are named at /Matrix_Inputs/N/Channel_Input/name (an
  address missing from DiGiCo's 2014 list). Their names now appear in
  every matrix-send dropdown, preset and the new matrix_in_N_name
  variables, falling back to "Matrix In N" when empty. Matrix inputs also
  get trim and phase.
- Console names are space-padded where the surface wraps them; every name
  is now trimmed and its whitespace runs collapsed ("LEAD V RESI").
- Meter values are inverted: 127 is silence and lower is louder, about
  1 dB per step below full scale (silent channels read 127, the room mic
  36-48). The module treated 127 as peak. Level meters now read dBFS
  (approximate), gauges span -60..0 dBFS, signal and peak thresholds are
  in dBFS; gain reduction reads dB of reduction, 127 meaning none.
- Bus and matrix outputs have meters (/Aux_Outputs, /Group_Outputs and
  /Matrix_Outputs/N/Output/meter): new signal, peak, value and gauge
  feedbacks and "Buss meters" / "Matrix meters" presets.

3002 presets, 2.7 MB. npm test: 425 checks pass on Node 25 and on
Companion's Node 22. Deployed and checked on the booth Companion 5.1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/README.md

@@ -68,7 +68,7 @@ inputs, `--auxes N` the busses (default 25), and the matrix (8 outputs, 10 input
 | `/Console/{Input_Channels,Aux_Outputs,Group_Outputs}/?` | **silent**, like the real console. All nine counts are pushed once, ~200 ms after the first datagram it receives |
 | `/Console/Aux_Outputs/types/?` | one `i` per buss, 1 = aux, 0 = group (a buss named only on the Group side is a group) |
 | `/Console/{Aux_Outputs,Group_Outputs}/modes/?`, `/Console/Input_Channels/modes/?` | one `i` per buss / input (2 = stereo, 1 = mono, captured) |
-| `/Input_Channels/N/Channel_Input/name/?`, `/Aux_Outputs/N/Buss_Trim/name/?`, `/Group_Outputs/N/Buss_Trim/name/?`, `/Matrix_Outputs/N/Buss_Trim/name/?`, `/Control_Groups/N/name/?`, `/Graphic_EQ/N/name/?` | `s`. Only input names accept a write here (not verified on the real console); the others are read-only. The 25 busses appear under both Aux_Outputs and Group_Outputs; a buss reports its name on the side matching its mode and `""` on the other. Matrix inputs have no name address |
+| `/Input_Channels/N/Channel_Input/name/?`, `/Matrix_Inputs/N/Channel_Input/name/?`, `/Aux_Outputs/N/Buss_Trim/name/?`, `/Group_Outputs/N/Buss_Trim/name/?`, `/Matrix_Outputs/N/Buss_Trim/name/?`, `/Control_Groups/N/name/?`, `/Graphic_EQ/N/name/?` | `s`. Only input names accept a write here (not verified on the real console); the others are read-only. The 25 busses appear under both Aux_Outputs and Group_Outputs; a buss reports its name on the side matching its mode and `""` on the other. Names are padded with trailing spaces and runs of spaces, as the surface reports them (matrix input names are read-only here) |
 | `/{Input_Channels,Aux_Outputs,Group_Outputs,Matrix_Outputs,Control_Groups}/N/fader/?` | `f`, dB, -150 = -inf, max +10 |
 | `/{...}/N/mute/?`, `/{...}/N/solo/?` | `f` 0/1 (a float, not an int); a SET must be a float too, see below |
 | `/Input_Channels/N/Panner/pan/?` | `f`, 0..1, 0.5 = centre |
@@ -78,17 +78,21 @@ inputs, `--auxes N` the busses (default 25), and the matrix (8 outputs, 10 input
 | `/Matrix_Inputs/N/Matrix_Send/M/{send_level,send_on}/?` | `f` (default -90 and 0, captured). A matrix send floors at -90 dB (verified on an S31): level writes are clamped to -90..10, never -150 as for faders and aux sends |
 | `/Graphic_EQ/N/{geq_in,geq_gain_1..32}/?` | `f` |
 | `/Input_Channels/N/{Channel_Input/{trim,phase,phantom,analog_gain,input_pad},Filters/{hi,lo}_filter_{in,freq},Channel_Delay/{delay_on,delay},EQ/eq_in,Dynamics/{comp_in,gate_in},Insert/insert_{A,B}_in}/?` | `f` (switches 0/1) |
-| `/{Aux_Outputs,Group_Outputs}/N/{Buss_Trim/{trim,phase},EQ/eq_in,Dynamics/{comp_in,gate_in},Channel_Delay/{delay_on,delay},Insert/insert_{A,B}_in}/?`, `/Matrix_Outputs/N/Buss_Trim/trim/?` | `f` |
+| `/{Aux_Outputs,Group_Outputs}/N/{Buss_Trim/{trim,phase},EQ/eq_in,Dynamics/{comp_in,gate_in},Channel_Delay/{delay_on,delay},Insert/insert_{A,B}_in}/?`, `/Matrix_Outputs/N/Buss_Trim/trim/?`, `/Matrix_Inputs/N/Channel_Input/{trim,phase}/?` | `f` |
 | `/Snapshots/Current_Snapshot/?`, `/Snapshots/count/?` | `i` |
 | `/Snapshots/names/?` | one `/Snapshots/name ,iiis [index, cue*100, 0, "name"]` per snapshot. `/Snapshots/name/?` without an argument stays silent (unreliable on the real console) |
 | `/Snapshots/Fire_Snapshot_number [i]`, `/Snapshots/Fire_Next_Snapshot`, `/Snapshots/Fire_Prev_Snapshot` | write-only triggers; the mock moves its current snapshot and pushes `/Snapshots/Current_Snapshot` |
 | `/Macros/Buttons/press [i]` | logged only (no macro query is answered) |
 
-**Meters.** Subscribe with `/Input_Channels/N/Channel_Input/post_meter ,ii [id, 1]` (post-fader level) or
-`/Input_Channels/N/Dynamics/GR_meter ,ii [id, 1|4]` (gate / compressor gain reduction), where the client
-chooses `id`. Every subscribed id then gets a random value 0..127 about five times a second, as
-`/Meters/values ,ii... [id, v, id, v, ...]` (only ids whose value changed). `/Meters/clear` drops every
-subscription, like the real console.
+**Meters.** Subscribe with `/Input_Channels/N/Channel_Input/post_meter ,ii [id, 1]` (post-fader level),
+`/Input_Channels/N/Dynamics/GR_meter ,ii [id, 1|4]` (gate / compressor gain reduction) or
+`/{Aux_Outputs,Group_Outputs,Matrix_Outputs}/N/Output/meter ,ii [id, 1]` (output level), where the client chooses `id`.
+The scale is inverted, as on the real console (verified on an S31, approximate): a level meter reads about the dB
+below full scale, so **silence is 127** and the mock's live channels (inputs 1-3, aux 1, group 9, matrix output 1) read
+20-60; a gain reduction meter reads the dB of reduction, 0-12, now and then 127 (inactive). Every subscribed id gets
+its value about five times a second, as `/Meters/values ,ii... [id, v, id, v, ...]` (only ids whose value changed, so a
+silent channel reports 127 once). `/Meters/clear` drops every subscription, like the real console. Control groups and
+matrix inputs have no meter address.
 
 A 0/1 switch (mute, solo, send on, group assign, matrix send on, `geq_in` and every channel-strip switch) is both
 reported **and written as a float** 0.0 / 1.0, verified on a real S31 on 2026-10-15 (the 2014 DiGiCo list says