Connections

  • Connect the DAC card to the Raspberry Pi with the USB cable
  • Connect the the 3.5 mm jack to an audio output

The USB Audio DAC card will be automatically recognized by the system (right-click on the speaker icon to verify)


Config the JACK audio server

  • Run QJackCtl (double click the icon on desktop)
  • Select Setup…
  • In the Settings tab select:

Interface: hw: DAC USB AUDIO DAC

  • Sample Rate: 44100
  • Frames/Period: 256
  • Periods/Buffer: 2
  • Remove the Realtime flag
  • OK to confirm

You can also try to insert lower values:
Frames/Period: 128 and Periods/Buffer: 3 or 4

  • Clic Start to run the JACK server


Config GrandOrgue

  • Run GrandOrgue (double clic the icon on desktop)

  • Select File > Settings…
  • Select the Audio tab
  • In Mapping output select the Audio Output device, then clic Change
  • Select PortAudio: JACK Audio Connection Kit: system, then clic OK
  • New Audio Output Device is now selected!
  • In Sound output section verify the right Sample Rate (44100) and Samples per buffer (256) values. It must have the same JACK configuration parameters
  • Clic OK to exit from Program Settings options
  • Select File > Save to store the new configuration


GrandOrgue hangs!

If GO freeze during the configuration steps, you have to terminate (kill) the program following this steps:

  • Open a Terminal window (clic on the icon near the Start Here icon)
  • Type ps ax | grep Grand to identify the GO running process number (PID)
  • Type sudo kill <process number> to close GO