Background: 10+ years with Linux and countless hours with linux sound (ALSA, JACK, etc...)
RPi 2.1 with PadKontrol (as MIDI controller), no DAC (audio out on stock Raspberry Pi), HDMI to monitor, USB stick with samples (Mellotron Flute sample library) and a QWERTY keyboard attached via usb.
Problem: No audio on MIDI trigger. Assigned note patches that exist in Mellotron sample library to pads in; sample library loaded without issue. No audio on MIDI event. See the following images to see what happens.
http://i.imgur.com/UentFfp.jpg (I've tried modifying AUDIO_DEVICE_ID with values 0-3 with the same result.)
http://i.imgur.com/rlh3wQL.jpg (python sound test)
Is the problem with the RPi DAC/audio out? If so, can anyone reccomend a DAC that I can purchase in the US (links to suggested DACs on samplerbox.org are in the UK) and is affordable( < 20$ ).
Samplerbox is the answer to multiple years of futzing with linux sound, really want to make this work, but can't get any output. Don't care if the output sounds like garbage right now, just want to get a signal out from a MIDI trigger to prove that the idea works. Thanks for your help!