I can't give you a solution but I can tell you what I did as a workaround when time was running short for me.
I put jack in the mix on both ends.
Someone had suggested that I edit an alsa config file. I can't remember the results of that. My setup was perhaps not exactly parallel to the suggested fix and I did not have time to dig deeper. You can perhaps search the list archive for the discussion.
In any case, once I had jack in the mix, I got stereo where I had mono before.
all the best,
drew
  
    
  
  
    Hi,
    Thanks to the amazing work and dedication to this wonderful project
    from some awesome engineers, I, as one of the somewhat inexperienced
    , have managed to create a working link using two Linux Mint v19.3
    PC's for our cash strapped community radio station. Thank you.
    I have a small query and a related question.
    
    Using the default test command line on both PC's, INFO on the TX PC
    reports "Started mono audio transmission" BEFORE I had
    started the RX PC link. This was a bit confusing, however, there was
    no audio until the RX link was started.
    
    I tested the link once established, for separation and found it is
    actually Mono!. I'm using default ALSA driver and two Behringer
    UCA-202's. I appreciate this is only the default settings and
    probably should use command line configuration options but in a
    previous version OpenOB worked as stereo "out of the box" using
    defaults. Has something changed in this regard. 
    
    So, is there any sort of tutorial on using the CL parameters. I am
    aware of the "Further Usage" paragraph referring to 'openob -h'
    etc but wondered if there was something more in depth to help me fix
    the Mono problem.
    
    Anything much appreciated.
    
    Chris Perkins
    Flame Radio
    Wirral
    
    
  
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