retrohunter wrote: 
> Fair enough, however ameter is an ALSA plugin (like hw, plug, asym) and
> not a GUI. You can write ncurses or GUI clients to monitor the VU levels
> if you wish. In my case, I wanted to provide a digital signal through
> GPIO and convert it to analog with a cheap DAC to drive mechanical
> analog VU meters.
> 
> 

Maybe you can bind two outputs by modifying the asound.config file.
I've done that a long time ago on the Wandboard (also to drive analog VU
meters).
Below is what I found in my old notes but you would need to modify it to
suite the PI.



Code:
--------------------
    
  # bind analog and spdif into a single card
  pcm.!default {
        type plug;
        slave.pcm {
        type multi;
        slaves.a.pcm "hw:0,0";
                slaves.b.pcm "hw:1,0";          
                slaves.a.channels 2;
        slaves.b.channels 2;
        bindings.0.slave a;
        bindings.0.channel 0;
        bindings.1.slave a;
        bindings.1.channel 1;
        bindings.2.slave b;
        bindings.2.channel 0;
        bindings.3.slave b;
        bindings.3.channel 1;
        }
  
  ttable.0.0 1;
  ttable.1.1 1;
  ttable.0.2 1;
  ttable.1.3 1;
  }
  
  
--------------------



'M-DAC' (http://www.audiolab.co.uk/M-DAC%20Series.aspx?lang=En) ->
'Focal MP1200' (http://www.mp1200.co.nf/) -> 'Focal Electra 1028 Be'
(http://www.focal.com/en/electra-1000-be-2/209-electra-1028-be-3544053695099.html)
1 x SB3, 1 x SB Boom, 1 x SB Radio and 2 x SB Touch - all wireless
1 x Wandboard Dual behind the bedroom ceiling
1 x Wandboard Dual for 'msqueeze' (http://www.msqueeze.co.nf/index.html)
project
1 x Wandboard Quad (will eventually become my LMS server)
ReadyNAS NVX running LMS 7.8.1. - 1402661598
iPeng 7 on iPhone.
SqueezePad & iPeng 7 on iPad.
http://www.last.fm/user/phibon
------------------------------------------------------------------------
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