> > I haven't had time to try and get any sound out of it yet! However, it is > > detected correctly in the mixer, and the driver thinks that there are 4 > > extra channels. I need to get some jack socket convertors to get some sound > > out, but will let you know. > > > > Please do so, thanks.
Hi Thomas, I tested this, and it does seem to work ok! I literally just squirted some sound through a single channel briefly, so this is nothing more than a "it works" test. I will get some plugs over the next few days for better trials. Thanks so much for your work on this! > For the "jittery & broken up audio" problem, are you running an > optimized audio kernel (preempt + lowlatency patched) ? > How frequent is frequently ? Can you find any relation between the audio > problems and external factors (disk access, heavy load, etc...) ? I'm using 2.6.1 mm-1 with the pre-empt option switched on. With low system load I seem to be able to get JACK to work for short periods with 1.5ms latency! 3ms and up latency works with JACK, reasonably despite some processing with Brutefir going on as well... I only tried it a couple of times, and I forget now whether I used both OSS emulation and ALSA devices, or just one? However, the effect was something like when you are feeding an audio file to the card at a fixed rate, and it's playing it at a faster rate, you get continuous snatches of sound and underflows leaving a short gap before sound restarts (multiple times per second). I will try it again and document exactly which apps and what my setup is. Sorry for the vague problem report... In the meantime I'm actually using the PAD card for general duties (ie watching TV) > For the mixer controls : there were some in the past, but I removed them > because I couldn't find any clean solution to deal with them while > changing speed mode (because their number changes at this occasion). > Maybe Jaroslav or Takashi have an idea on the subject ? When I last > worked on this, the only solution I could find would have been to mess > up with a semaphore held by the alsa-lib layer and although it would > have worked, it would have been plain ugly. > Anyway I plan a massive redesign of the way the driver and userspace > apps interact regarding the matrix mixer, mostly to enable several > application to access the mixer at the same time in a cooperative way > (how about an alsaseq client or a ladspa plugin accessing the matrix > with the changes reflected in hdspmixer ? :). This is the prerequisite > of some work I want to do with jack and ardour to handle hardware > monitoring in a better way. I could indeed add a master volume control > at this occasion. I hear what you are saying. Would it be possible to have a very badly behaved master mixer control which possibly has a rather confused view of min and max levels even? The situation I would rather like to get to is that I could use the output mixers on each channel to set a maximum amplitude for that channel. The physical analogue outputs are then likely to feed directly into power amps with no preamp (perhaps an attenuator in the way though). The master control (lets call it a fader) will operate on all channels individually, and adjust them equally (in dB, not linearly), so that I effectively have a home theatre 5.1 output directly into the power amps. The master fader control is effectively applying a 0-100% scaling on the output mixer, bearing in mind that each output channel may well have different absolute levels (depends how close each speaker is). Does this sound easier? Is it feasible? It would be very exciting if this could be made to work. I suspect this feature alone would sell RME some sound cards... (not that you care, just an aside!) For what it is worth, the card will likely be fed by JACK via a Brutefir filter to do room correction based on a filter designed using Brutefir. (A very interesting project that is well worth experimenting with...) Thanks so much for taking the time to listen - much appreciated Ed W ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
