From: toby@tobiah.org   
      
   I have a Denon POA-220 stereo amplifier that I use   
   to monitor an audio interface when running Windows.   
   This interface does not work under Linux, But I have   
   a Scarlet 2i2 that does.  I tried using a Radio Shack   
   stereo switch to change the amplifier source between   
   the two interfaces, but it introduced noise.   
      
   So I noticed that the amp has two RCA inputs for each   
   channel:   
      
      https://tinyurl.com/mrxzrwuf   
      
   one marked "CD" and the other "NORMAL".  I'm tempted   
   to use these to connect both interfaces at once, but   
   something tells me that may not be a great idea.  There   
   are no input switches on the amp.  The only controls   
   are power, and speaker A/B switches.   
      
   My main interface is a Presonus 1810, with the older   
   USB connection.  It seems that the USB-C version is   
   supported by Linux, but I can't get my version to work,   
   although I do see some Alsa devices (but not the outputs)   
   in the mixer.   
      
      
   Toby   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)