I tried the latest firmware (alsa mmap update) and still the same issue. PD cpu usage seems lower now though, at about 8% with a simple test patch and stereo out.

Don't get me wrong, stereo audio out works with the UA-25 on rPI. The issue is that full duplex (stereo in & out) do not, resulting in crackling audio out. :P

On May 4, 2013, at 12:51 PM, pd-list-request@iem.at wrote:

From: Dan Wilcox <danomatika@gmail.com>
Subject: Re: [PD] UA-25 on RPI
Date: May 4, 2013 12:50:47 PM EDT
To: Antoine Villeret <antoine.villeret@gmail.com>
Cc: pd-list list <pd-list@iem.at>, Miller Puckette <msp@ucsd.edu>


No thanks. The UA-25 is bus powered, has two XLR+jack inputs, phantom power, rca/jack outputs, direct monitor, individual channel gain control, master gain control, and in a road tuff metal case. I have two of them, so it makes sense to dump the PI if I can't get it to work with proven linux friendly hardware especially when the pi costs less.

Too bad. Back to iPad now ... :D

--------
Dan Wilcox
@danomatika