Hi :) there's no audio output by a HDSPe AIO, neither for $ pulseaudio --kill, nor for $ pulseaudio --start. Maybe I miss the forest for the trees. I'm not working on my Arch Linux at the moment, I just tried to get some sound on the quick from YouTube and then speaker-test. A test tone from the mixing console to the RME stereo input is shown by the HDSP Mixer's meters. Audio in seems to be ok, just audio out seems to be disabled. $ uname -a Linux archlinux 3.1.7-1-ARCH #1 SMP PREEMPT Wed Jan 4 08:11:16 CET 2012 x86_64 AMD Athlon(tm) X2 Dual Core Processor BE-2350 AuthenticAMD GNU/Linux $ groups lp wheel games video audio optical storage scanner power users $ pacman -Qs alsa local/alsa-firmware 1.0.24.1-1 ALSA firmware package local/alsa-lib 1.0.24.1-1 An alternative implementation of Linux sound support local/alsa-plugins 1.0.24-3 Extra alsa plugins local/alsa-tools 1.0.24.1-1 ALSA tools package local/alsa-utils 1.0.24.2-3 An alternative implementation of Linux sound support local/pulseaudio-alsa 1-2 (pulseaudio-gnome) ALSA Configuration for PulseAudio $ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: Default [RME AIO_579bcc], device 0: RME AIO [RME AIO] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: EWX2496 [TerraTec EWX24/96], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: EWX2496_1 [TerraTec EWX24/96], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 $ lsmod|grep '^snd' | column -t snd_ice1712 59678 4 snd_ice17xx_ak4xxx 2436 1 snd_ice1712 snd_ak4xxx_adda 9125 2 snd_ice1712,snd_ice17xx_ak4xxx snd_cs8427 6969 1 snd_ice1712 snd_ac97_codec 114391 1 snd_ice1712 snd_hdspm 58424 0 snd_pcm 74368 3 snd_ice1712,snd_ac97_codec,snd_hdspm snd_timer 19544 1 snd_pcm snd_i2c 4065 2 snd_ice1712,snd_cs8427 snd_mpu401_uart 6011 1 snd_ice1712 snd_rawmidi 19458 2 snd_hdspm,snd_mpu401_uart snd_page_alloc 7153 1 snd_pcm snd_seq_device 5300 1 snd_rawmidi snd_hwdep 6357 1 snd_hdspm snd 58362 20 snd_ice1712,snd_ak4xxx_adda,snd_cs8427,snd_ac97_codec,snd_hdspm,snd_pcm,snd_timer,snd_i2c,snd_mpu401_uart,snd_rawmidi,snd_seq_device,snd_hwdep $ hdspmixer HDSPMixer 1.6 - Copyright (C) 2003 Thomas Charbonnel <thomas@undata.org> This program comes with ABSOLUTELY NO WARRANTY HDSPMixer is free software, see the file COPYING for details Looking for RME cards : Card 0 : RME AIO S/N 0x579bcc at 0xfdbf0000, irq 18 RME AIO found ! Card 1 : TerraTec EWX24/96 at 0xbf00, irq 20 Card 2 : TerraTec EWX24/96 at 0xbb00, irq 21 1 RME cards card found. Restoring last presets used I used this preset with Debian, so I can't miss something muted, anyway I muted and unmuted, resp. changed settings. Regards, Ralf