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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
9 - 8
Volume Control
Volume control in the room can be accomplished by adjusting the fader con-
trol on the “Amplifier” virtual channel as follows:
inc fader “Amplifier” 1
will increase the gain on the “Amplifier” channel by 1dB and
dec fader “Amplifier” 1
Alternatively the fader settings may be set to an absolute value with the set
command as follows:
set fader “Amplifier” 0
to set the value of the fader to 0dB.
The volume control range can be limited by setting a fader max and fader min
as shown in the API syntax below:
set fader max “Amplifier” 10
set fader min “Amplifier” -10
to limit the maximum and minimum user range of the fader control to +10 and
-10dB respectively. The max and min ranges only need to be set once and can
be configured as part of the SoundStructure Studio configuration file. If the
current amplifier fader setting is outside of this range, the range of the maxi-
mum or minimum fader values will be adjusted to include the current fader
setting.
In other words, to set a fader max or min value, the current fader value must
be within the range of values. Otherwise the range is extended to include the
current fader value.