20
Controlling Audio Inputs
Analog Input Control
- Allows one or more input
gains to be controlled by an analog voltage on a
programmable input pin. Analog input gain
control goes from a maximum of 0dB gain to a
minimum of 30dB attenuation, plus “Off”. The
gain change resolution is 1dB. The Analog Input
Control mode is ideal for using a pot (or some
other source of analog voltage) to control input
gain. The valid voltage range in the Analog Input
Control mode is 0VDC to 5VDC. 0VDC corre-
sponds to “Off” (or Rear Panel Minimum Input
Gain, if it is programmed for less attenuation than
“Off”), and +5VDC corresponds to 0dB. In
addition to analog control, this mode can be used
to perform input “muting” using a simple toggle
switch. To mute input(s), simply connect the
toggle switch to connect the programmable input
to ground (GND pin). The screen shown here
indicates that the function of programmable I/O
number 1 is set to provide an analog input control
of inputs 1, 2, and 4. Notice how multiple inputs
may be controlled by a single programmable input.
Increase In 1dB / Decrease In 1dB
- Allows one or more input gains to be controlled by a contact closure on a
programmable input pin. Increase and Decrease input gain control goes from a maximum of 0dB gain to a minimum
of 30dB attenuation, plus “Off”. The gain change resolution is 1dB. In the case of Increase In 1dB, each contact
closure will increment the input(s) gain by 1dB until 0dB is reached. Decrease In 1dB will decrement the input(s)
gains by 1dB until either “Off” or Rear Panel Minimum Input Gain is reached. If the contact closure is pushed and
held, it will continue to increment or decrement until it is released or the gain reaches its high or low limit.
Mute In (Toggle)
- Allows one or more inputs to be temporarily muted. The first momentary contact closure on the
programmable input pin will mute the specified input(s), and the next momentary contact closure will unmute them.
