From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kai Vehmanen Date: Tue, 31 Aug 1999 08:09:00 +0000 Subject: loopback in action! Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sound@vger.kernel.org ALSA kicks ass! :) Seriously, I'm currently writing a ALSA plugin for Michael Krause's soundtracker. It's still in early beta (output only, scopes aren't working, etc), but simple module playback works nicely. Anyway, I decided to finally do some real testing with ALSA pcm-loopback and it proved to work amazingly well... First, configured sountracker to use ALSA card 0 and device 0. Then started playing some mod file and on to another console...: ecasound -i alsalb,0,0 -o alsa,1,0 -etr:40,0,60 A reverbed version of the module comes from my speakers! :) And... ecasound -i alsalb,0,0 -o alsa,1,0 -efl:2000 -kos:1,200,4000,0.2 A lowpass filtered version with a 0.2Hz sine oscillator controlling the filter cutoff! Don't know how useful this is, but this sure put a big smile on my face. ;) Software versions used were ALSA 0.4.0, SoundTracker 0.3.1 (w/ patched ALSA support) and ecasound 1.5.6r5. PS The biggest problem was that if I tried to capture output from my AWE64G, the capturing program sometimes exited with a "Interrupted system call" error... -- Kai Vehmanen ----------------------------- CS, University of Turku, Finland : email mailto:kaiv@wakkanet.fi : audio processing for linux http://www.wakkanet.fi/ecasound/ : my music (ambient-idm-rock-...mp3/ra) http://www.wakkanet.fi/sculpscape/