Choose a specific audio channel

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So what you want can be done this way:

1. Start Hybrid
   
2. Load your Source (Base->Open File)
   
3. set 'Base->Processing->Audio' to 'custom'
   
4. enable 'Audi->Base->Audio Encoding Options' (audio reencoding is necessary since you can't change the channel layout otherwise)
   
5. enable 'Audi->Base->Audio Encoding Options->Filtering->Downmix' to 'custom' and enter '2v1' into the box on the right. This tells sox to only use the second channel (2) with it's full volume (v1), if you wanted to use the left channel instead you would use '1v1' if you wanted to mix both channels you could use '1v0.5,2v0.5'. You could also use '2v1 2v1' if you wanted the ouput to be stereo and each of the channels should contain the second audio track of the input.
   
6. set the 'Audi->Base->Audio Encoding Options->Encoder' option the way you want them
   
7. add the audio setting to the audio queue 'Audi->Base->Add current'
   
8. configure Hybrid the way you want
   

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