Modifying a Backfeed using a VMixer
Scope
How to use the VMixer in the Fusion Engine, Powerstation, or Telos iPort to modify the audio sent back to a codec or phone caller from an Axia console.
Description
Most of the time, the standard mix minus from an Axia console engine's backfeed is good enough. Sometimes a programmer will want to mix additional audio with the mix minus that a caller hears. For example, a preview bus or additional talk back. This example uses a Fusion Mix Engine and a Telos VX, but this can apply to many other products.
Intercept the Backfeed
- Determine the Livewire channel being used for transmission. The easiest way is to visit the source profile and read the value of the Primary Source field.
- In the VMixer, set a channel's Input Selector to EXTERNAL
- Enter this channel number into the Input Channel field.
- Set the Stream Type to To source.
- Set Enable to On
- Click the Apply button below the VMixer you are using.
Set up VMixer Output
- Go to the Submix section of the VMixer you are using and enter an available Livewire channel into the Channel field.
- Label the output in the Out Name field.
- Set the Out Stream Type to Live Stereo
- Click the Apply button below the VMixer you are using.
Replace the Backfeed
- In the codec, hybrid, or VX Studio, disable Automatic Backfeed, enter Expert Mode, or tick the checkbox under Advanced Receive (depending on what you are working with).
- Enter the Livewire channel of the new backfeed into the channel/destination field
- Set the stream type to From Source.
- Click Apply
Modify the Backfeed
At this point, the original backfeed is being sent to the VX from the Fusion engine with a VMixer in the middle.
You can now add more audio sources to the VMixer and modify it how ever the VMixer allows.
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