Ryan Underwood wrote: > I'm confused on MIDI deviecs. :) Rather than bore you with the details of > what I think is right, (since it is most likely wrong), can someone explain > what each of the following do?: > > /dev/snd/midiC0D0 > /dev/snd/midiC1D0
ALSA raw MIDI devices for card 0 and card 1 (see /proc/asound/cards for the card number assignments). "Raw MIDI" means that you can send/receive MIDI with these, but witout any meta information like timing. These files are useful for sending/ receiving raw SysEx data (.syx files), but not for much else. > /dev/snd/seq The ALSA sequencer, which handles all ports on all cards. You're not supposed to use this file directly. For a list of ALSA sequencer ports, run "aconnect -io". > /dev/sound/dmmidi "dm" = direct music IIRC. I guess this is for an OPL3 FM synth. > /dev/sound/midi00 This is pretty much identical to /dev/snd/midiC0D0. There should be a midi01 file for your second card. (?) > /dev/sound/sequencer The OSS sequencer, which handles all ports on all cards. > /dev/sound/sequencer2 Another API for the OSS sequencer. > I have a Vortex AU8830 card using the alsa driver. It has a MPU401 UART > that is enabled. I also have an ISA Roland MPU401 card using snd-mpu401 > that is loaded after the vortex driver. My keyboard is attached to the > ISA MPU401 card, and it also has a waveblaster card on it. The sound > card has nothing attached to its joystick port or internal connector. > > Pressing keys on my keyboard plays notes on the waveblaster card, which > goes out the stereo connector on the mpu401 card and to the line-in on > the sound card. So I know the MIDI setup is working apart from ALSA. > > /dev/snd/midiC0D0: > cat and press keys on my keyboard, I see nothing. > cat a midi file to it, hear nothing. OK, because nothing is connected to card 0. > /dev/snd/midiC1D0: > cat and press keys on my keyboard, I see some sort of note data, one/two bytes at a > time. OK. > ... cat a midi file to it, hear crazy stuff, dmesg complains: A .mid file contains headers and timing information. When you cat a file to the rawmidi device, all bytes are sent at once, and the timing information will be interpreted as MIDI commands, too. > /dev/snd/seq: > cat and press keys, see nothing > cat a file to it, "write error: Invalid argument" To play MIDI files, use a program with ALSA sequencer support, like pmidi. > The data coming from midiC1D0, sequencer, and sequencer2 are all > different, but responds to my keyboard, so it must be the MIDI data > coming from the ISA MPU401 card, right? Yes. However, there isn't any device file that would output .mid files, you have to use a sequencer to record MIDI files. HTH Clemens ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
