[How to do instruction] Camilla DSP

[bitlab]

@lurkio maybe it easier; try to use the HDMI 7.1 output with a HDMI 7.1 audio extractor.
I'm not sure if it really works, but for arround $50 you can buy a cheap quality device to see if it works at all. 
And if so buy another device to upgrade the sound quality to the required level. (like http://www.cypeurope.com/store/store/app....2-HDMI2.0 ).
With 8x channels the max samplerate is limited.

I tried the following procedure on my Pi 4, but I have no mini hdmi cable or audioextractor to verify if the audio plays correct:

• Activate HDMI as active output device
  
• Create new crossover.yml config with the example below
  
• Upload the crossover.yml with upload button on the moode camilladsp config screen
  
• Active the crossover configuration and press save
  
• After that toggle the default device button to off and save
  
• At the pipeline editor section
  
• Toggle expert mode to on
  
• Toggle status to on
  
• Open the editor
  
• In the playback device settings, change the channels from 2 tot 4
  
• Connect with mini hdmi to hdmi cable to a hdmo 7.1 audio extractor.
  
• If you now play music, you will see at the audio multichannel output is active
  

The crossover example config taken from the camilladsp site:

Code:

---
devices:
 samplerate: 44100
 chunksize: 1024
 capture:
   type: Alsa
   channels: 2
   device: "hw:Loopback,0,0"
   format: S16LE
 playback:
   type: Alsa
   channels: 4
   device: "hw:0"
   format: S16LE
   
mixers:
 to4chan:
   channels:
     in: 2
     out: 4
   mapping:
     - dest: 0
       sources:
         - channel: 0
           gain: 0
           inverted: false
     - dest: 1
       sources:
         - channel: 1
           gain: 0
           inverted: false
     - dest: 2
       sources:
         - channel: 0
           gain: -5.0
           inverted: false
     - dest: 3
       sources:
         - channel: 1
           gain: -5.0
           inverted: false

filters:
 highpass2k:
   type: Biquad
   parameters:
     type: Highpass
     freq: 2000
     q: 0.707
 lowpass2k:
   type: Biquad
   parameters:
     type: Lowpass
     freq: 2000
     q: 0.707
 bafflestep:
   type: Biquad
   parameters:
     type: Highshelf
     freq: 500
     slope: 6.0
     gain: -4.0

pipeline:
 - type: Mixer
   name: to4chan
 - type: Filter
   channel: 2
   names:
     - highpass2k
 - type: Filter
   channel: 3
   names:
     - highpass2k
 - type: Filter
   channel: 0
   names:
     - lowpass2k
     - bafflestep
 - type: Filter
   channel: 1
   names:
     - lowpass2k
     - bafflestep