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I am pretty new to Raspberry, so sorry if i'll be not clear on something. I am trying to set the RP3 to work running a PD patch while communicating with two Arduino UNO, and getting it work just plugging it, so running the patch auto-starting after boot. There are so many things I would like to ask, but I'll remain strict to the topic, also one of my first problem. I switched to Patchbox OS cause I need a minimal system for audio working. I am now using PureData running with jack (Pd->media->jack) cause it is not working with ALSA, but it seems to me that running jack is not the properly way: clicks and pops are showing up also if CPU meter is between 15% and 25%. So I started searching for some solution. I found in this site another related-question with a well explained answer: here. The problem with that comes just in the first steps, after calling

 patch@patchbox:~ $ cat /proc/asound/cards
 0 [ALSA           ]: bcm2835_alsa - bcm2835 ALSA
                      bcm2835 ALSA
 1 [USB            ]: USB-Audio - Scarlett 2i4 USB
                      Focusrite Scarlett 2i4 USB at usb-3f980000.usb-1.5, high speed

I call amixer this is the results:

amixer -c 1
Simple mixer control 'Internal Validity',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

So the system is not recognising real ins and outs of my audio interface. Also there is this problem with PD, that when I chose ALSA as driver (Pd->media->ALSA) I get the problem reported on the title [ALSA input error (snd_pcm_open): No such file or directory] I hope I have been clear, Thanks to all

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