[LAU] Raspberry PI, internal audio IF + testing new USB IF

Hello dear all. I'm testing a small interface for some musical and technological projects which has an instrument input jack on one side and no audio output, just USB on the other side. This IF works great but you have no physical audio output to monitor/hear sound, so I thought I could enable internal audio IF (as I've done on other devices) and that will be the audio output instead of needing another second IF to get audio from. So I decided to rescue some past investigations I made when first researching about RPi, along with the great content generated by some dear great folks in here, and some new research one after each problem. First started from a Raspbian 2012 version which I had already tweaked for a headless autojamming/instrument effects/looper, but got many issues making step by step progresses that I briefly point here FWIW: - Enabled internal IF on Raspbian 2012 [1] - Found mmap problem regarding using Jackd with internal IF [2], even tried a module somebody compiled - Tried switching to the new platform version, Raspbian 2015 (raspberrypi 3.2.27+) but there wasn't even /proc/asound - Couldn't get to load snd-bcm2835 kernel module for internal soundcard [4] - Finally I got an error from the very raspi-config regarding internal audio IF [5] Although I continue researching, I guess somebody here has already gone through some of this, but I'm wondering if it's already an abandoned thing by the makers themselves this thing of the internal IF thing. Thanks as always. Greetings all. +info: [1] enable internal souncard on Raspbian 2012 https://duckduckgo.com/?q=%22raspberry+pi%22+enable+internal+soundcard&… http://www.raspberrypi.org/forums/viewtopic.php?f=66&t=18573 http://stackoverflow.com/questions/12144972/jack-audio-connection-kit-jackd… [2] enable mmap to run jack with internal soundcard on Raspbian 2012 https://martinezjavier.wordpress.com/2013/04/27/mmap-support-for-raspberry-… https://www.hifiberry.com/forums/topic/jackd/ [3] cat: /proc/asound: No such file or directory https://duckduckgo.com/?q=%22cat%3A+%2Fproc%2Fasound%3A+No+such+file+or+dir… http://forums.debian.net/viewtopic.php?t=74914 http://forum.ubuntu.ru/index.php?topic=99987.105 http://forums.debian.net/viewtopic.php?p=415341 [4] error when loading snd-bcm2835 kernel raspberrypi 3.2.27+ module for internal soundcard on Raspbian 2015 https://duckduckgo.com/?q=%22libkmod%3A+ERROR+..%2Flibkmod%2Flibkmod.c%3A55… http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=36445&p=3058… [5] error raspi-config when enabling audio via minijack on Raspbian 2015 https://duckduckgo.com/?q=raspberry+pi+%22there+was+an+error+running+option… http://www.hifiwigwam.com/showthread.php?115856-Raspberry-Pi-2/page3 -- C. sanchiavedraZ: * NEW / NUEVO: www.sanchiavedraZ.com * Musix GNU+Linux: www.musix.es