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zon is zone
1 to 255 (zone-0 not permitted)
vvl is left volume level
0 to 35 (2-dB/increment) (see note 1, 7)
vvr is right volume level
0 to 35 (2-dB/increment) (see note 1, 7)
vol is volume (left and right)
0 to 35 (2-dB/increment) (see note 7)
bas is bass level
0 to 8 (3-dB/increment) (see note 8)
trb is treble level
0 to 8 (3-dB/increment) (see note 8)
tpr is taper-enable
0=no-taper, 1=taper-volume
sta is audio-state code
0=off, 1=on, 2=on/muted-audio
gbz is group-base-zone
1 to 249; on 8-zone increments (eg: 1, 9, 17... ) (see note 6)
gzd is group-zone-definition
0 to 255 (each bit specifies 1 of 8 zones, starting at gbz) (see note 6)
Volume/Bass/Treble/Mute Notes:
Note 1 – Absolute Left and/or Right Volume (*CW,20), and Absolute Bass and/or Treble (*CW,40) commands:
Volume level parameters vvl and vvr may both be defined, or either may be IGNORE (to only set the one channel)
For IGNORE, set the parameter to 255, or, optionally, insert the ‘X’ character. Either bas or trb may be set to IGNORE.
Note 2 – Tapering with Absolute Volume commands (*CW,20/23):
If parameter tpr is set to 0, the absolute volume is set immediately. If tpr is set to 1, the level tapers-up or down using
the zone’s tud/tdd taper configuration.
Note 3 –Volume-Ramping commands (*CW,35/36/37/64/65/66):
Volume levels are reported only when ramping is stopped (not at each increment).
Note 4 – Mono zone with Left and/or Right Volume commands (*CW,20/26/27/28/29):
If a zone is programmed for mono operation, the same source must be routed to both the L&R channels, but these
volume commands allow you to provide independent volume control for two mono areas. You may also apply
relative-up/down control to both L&R as a “master” control of this 2-channel area, while retaining independent “sub-zone”
control over each channel with the individual (L or R) volume commands. This is handy in patios etc.
Note 5 – Zone Balance commands (*CW,30/31):
The Balance-to-Left command increases the left channel by 2-dB, and decreases the right channel by 2-dB. The
Balance-to-Right command is the opposite. For finer control you can adjust only one channel with the *CW,24/25
commands. The left and right volumes may remain at different levels -- the volume up/down and ramping commands
operate on both channels, relative to the volume of each. Balance is maintained when muting/unmuting, and running
volume to the rails and back. After balancing a zone, adjust the volume to the desired level for zone turn-on, and save
the current levels as the Initial-Volume-Levels (balance will be maintained, since left and right initial levels are saved).
