Paul, Great info. I didn't know about modinfo. Is there a way to query what the current setting of these parameters are? It seems that I'm told I have a range to work in, like 1-8, but no indication of how they are currently set or what they do. (Maybe only read the code?) I'm sure that many are just on/off sorts of things, but some clearly are not. Mark -----Original Message----- From: linux-audio-dev-admin(a)music.columbia.edu [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of Paul Davis Sent: Thursday, December 19, 2002 6:21 AM To: linux-audio-dev(a)music.columbia.edu Cc: Alsa-List Subject: Re: [linux-audio-dev] RME Hammerfall DSP Cardbus+Multiface actually, i doubt that this is the issue at all. the hdsp driver has a module option: snd_line_outs_monitor (possibly changed in recent versions to just "line_outs_monitor"). if set to a non-zero value, all other outputs will be monitored on the headphone/line out channels. you can find out about module options using the modinfo command. for example: % modinfo snd-hdsp filename: /lib/modules/2.4.19/kernel/sound/pci/rme9652/snd-hdsp.o description: "RME Hammerfall DSP" author: "Paul Davis <pbd(a)op.net>" license: "GPL" parm: snd_index int array (min = 1, max = 8), description "Index value for RME Hammerfall DSP interface." parm: snd_id string array (min = 1, max = 8), description "ID string for RME Hammerfall DSP interface." parm: snd_enable int array (min = 1, max = 8), description "Enable/disable specific Hammerfall DSP soundcards." parm: snd_precise_ptr int array (min = 1, max = 8), description "Enable precise pointer (doesn't work reliably)." parm: snd_line_outs_monitor int array (min = 1, max = 8), description "Send all input and playback streams to line outs by default." parm: snd_force_firmware int array (min = 1, max = 8), description "Force a reload of the I/O box firmware" the parameter defaults to zero, so by default, you hear nothing. there is no way to use any existing linux audio mixer to control *what* you hear - the hdsp has 1542 mixer controls arranged in a matrix, and its just not possible to make sense of this with mixers designed around a few channels with direct routing. work is proceeding on an equivalent to RME's TotalMix to offer ways of controlling this. --p