organise stereo monitoring for Jack Audio Connection Kit

 zita-mu1 is a simple Jack application used to organise stereo monitoring.
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 Main features:
  - Four stereo inputs.
  - K20 RMS/peak meters and stereo correlation meter.
  - Two monitoring outputs with individual volume controls.
  - Left / Right / Mono and Dim swithes.
  - Output of unmodified selected input, e.g. for metering.
  - Talkback level controls and buttons with automatic dimming of speakers.