Hi Fernando Can't help you on the coding but if you find a way to link two RME PCI hdsp cards to show as one please pass this along. I have two cards that I have to constantly change as the Bois seems to change the order of the cards on Boot up ( I use jack to select the cards) Cheers Bob Blueslsd On 29 March 2010 18:49, Fernando Lopez-Lezcano <nando@xxxxxxxxxxxxxxxxxx>wrote: > At CCRMA we have several studios with linux computers in them (in > addition to computers sprinkled throughout the building). Some of the > studios have digiface interfaces, some multiface. All of them are > connected to the sound system or mixer digitally through adat > lightpipes. Workstations have Delta 66 or Gina3G soundcards. > > It would be nice for a user to be able to play, say, a stereo Ardour > session in any of them without any changes to the session or routing. > > The digifaces send channels 1-24 out the adat ports. The multifaces on > the other hand send 9-16 on the adat port. Deltas and Ginas send out > stuff on channels 1-4 or 1-6. > > You can see the multiface interfaces are a problem. To get sound out of > them you have to send on channels 9-16 which is different from _all_ > others! > > I tried several workarounds without much success: > > a) fix this at the alsa level. Should be the way to go, right? Create > an /etc/asound.conf that uses ttable to translate channels for the > multifaces so that the digital out is actually sent through channels 1-8 > (and create the same name plug interface in all other computers that > does nothing so that the user can set that name as the default in > qjackctl and will get the same behavior in all computers). > > Works, but not quite. When I try to use that "fake" plug interface with > jack2 I get a warning that I'm using a plug interface (sort of fair) and > jack only opens it with _2_ i/o channels (even though the ttable is 18 > channels wide!). If I _force_ input and output channels in jack to 18 it > does work fine. But now it will _not_ work on other computers that have > less (or more) than 18 channels. Argh. > > b) fix it in hdspmixer. Well, it turns out that hdspmixer does not read > the default matrix gains from a file so I can't really override the > default. AFAICT the gains are calculated algorithmically in the code and > there is no command line option to load presets from a file. > > Or I could write a small script that will set the right gains for 1-8 to > go out through 9-16 but if a user starts hdspmixer that gets undone with > no warning. > > And, of course: > > c) give up and connect an 8 channel analog snake to the analog outputs > of the multifaces and do away with a digital connection to the mixer... > > Anyone has any other suggestions?? > This should be easy to fix, right? > :-) > -- Fernando > > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-dev > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
