Zektor ProAudio 16™ DSP Preamp Audio Matrix - Manual (Page 17)

ClarityAudio Serial Protocol, Version 1.01, 11/8/12 15
Audio Control
Response Strings:
^=MV vol$
Where:
vol = Volume in 0.5dB steps with an offset of 200. Range is 0 to 248.
The volume command is given in 0.5dB steps and uses an offset of 200 to indicate a attenuation of
0.0dB, 199 indicates 0.5dB of attenuation, and so forth, all way down to 1, which indicates an attenua-
tion of 99.5dB (or a gain of -99.5dB, depending on how you look at things).
The value 0 is special in that it indicates full attenuation, or fully muted audio (-115dB).
‘VZ’ Set Zone’s Volume
Each zone has a volume level that can be set from 0dB attenuation (full volume), to -99.5dB attenua-
tion, with a value of -100dB representing a full (more than -115dB) of mute.
There are three different ways of adjusting the volume:
1 Jump immediately to the new volume.
2 Fade to the new level in the time given by the ‘VRT’ command.
3 Fade to the new level using the slope given by the ‘VRT’ command.
(See “‘VRT’ Set Volume Ramp (Fade) Times” on page 19)
To fade to a new level over a given period of time, add 10000 to any volume command.
To fade to a new level at a given ramp speed, add 20000 to any volume command.
For a better explanation, see the examples that follow.
Volume gain is set in 0.5dB steps.
The format used to jump immediately to a new level is:
^VZ @ zone,@zone,vol Set the volume of a zone or zones.
^VZ @ zone,+step$ Add ‘step’ number of 0.5dB steps to current volume.
^VZ @ zone,-step$ Subtract ‘step’ number of 0.5dB steps from current volume.
^VZ ?$ In polled mode, reads current settings of all volume changes.
^VZ @ zone,@zone,?$ Read current volume settings of given zone(s).
Response Strings:
^=VZ @ zone,vol$
Where:
@ zone = One (or more) zones to be affected.
vol = Volume in 0.5dB steps with an offset of 200.
To jump immediatly to a new volume, the range is 0 to 248.
To fade to a new level in a given time period the range is 10000 to 10248.
To fade to a new level at a given speed the range is 20000 to 20248.
The volume command is given in 0.5dB steps and uses an offset of 200 to indicate a attenuation of
0.0dB, 199 indicates 0.5dB of attenuation, and so forth, all way down to 1, which indicates a gain of -
99.5dB (or an attenuation of 99.5dB, depending on how you look at things).
Using the ‘+’ or ‘-’ modifiers to adjust the current volume level will disable the mute command.
(See“‘VMZ’ Mute a Zone using Volume Control” on page 19.) The current volume level used will
be the value heard by the user (volume - mute attenutation). In other words, when adjusting the volume
using +/- values, the volume will go up or down from the current value being heard by the user, regard-