Parlé VBC 2800

ALS Source Control 

The Parlé VBC 2800 ALS output has the option to select (or mix) between the following sources: 

• Disabled (no audio is routed to the ALS output) 

• Far End Only (i.e. audio from USB Playback path of USB Host and/or Auxiliary Input depending on inputSource control) 

• Near End Only (i.e. audio from the microphone) 

• Far and Near End Mixed 

Note that these settings persist between reboots. 

USB audio is stereo. 

Auxiliary (Analog) audio is mono. 

Microphone audio is pre-AI noise reduction to maintain a comfortable experience for the ALS listener. 

The following commands are supported: 

Get the currently selected input: 

Command: 

ALSSource get input 

Expected return: 

+OK "value":0 

Values: The return value will be a single digit which can be decoded below: 

0: Disabled 

1: Far End Only 

2: Near End Only 

3: Far and Near End Mix 

Set the currently selected input: 

ALSSource set input [0, 1, 2, or 3] 

The [input] uses the same values that the get command uses (detailed above) – range of 0 to 3 for this command. 

Example command: 

ALSSource set input 1 

Expected return: 

+OK