(Intentionally cross posted) The following quotes are from an email to a rosegarden mail list -- Rosegarden is a music notation (mcow) program.
A user is describing a problem in which it appears the MIDI ports (connected via USB ports) change on each boot (or maybe even each start of the Rosegarden program). I just wondered if this is similar to the current Linux behavior related to disks wherein, in the old days, disks came up in a consistent order, but nowadays (maybe because of systemd?) they (or some of them) can start in parallel and thus their device numbers are not consistent. If a similar problem does exist with USB ports, is there a way to force them to be identified in a consistent way on each boot (i.e., something like using UUIDs or labels for disks)? Thanks! On Tuesday, June 30, 2020 10:46:30 AM Ted Felix wrote: > On 6/30/20 5:20 AM, Malhaire Christophe wrote: > > 1) While using Rosegarden, I cannot play a video on Youtube, or play a > > piece of music using Parole Media Player. > > Off the top of my head, it sounds like those programs likely use > ALSA, but you have JACK running. When JACK is running, it takes over > ALSA and anything trying to use ALSA will be "broken". > > There may be a way to get ALSA and JACK apps to cooperate. I seem to > remember an article on the JACK website. This is a common complaint. > > > 2) Each time the PC and Rosegarden are restarted, I have to check and > > change my MIDI connections because the MIDI ports of my external USB > > sound modules are systematically inconsistent (MIDI Playback devices > > related to MIDI Outputs). > > This is interesting as we've had this complaint before. I really > would like to work on fixing this, if possible, but the other user > reported that the problem went away. > > To get a closer look at what rg is doing to make those connections, > load a composition, then go to Edit > Preferences... and press the > "Details..." button next to "Sequencer Status". This should show you > the connections it is trying to make. If you can post what's in there, > that might help with figuring out what we might be able to do to fix this. > > > I believe Rosegarden has an internal function > > for "smartly" attaching a MIDI device, according to its name, but it > > doesn't work for me. Surely I must miss something but what? > > It's all automated, so not really anything you can do. We need to > have a closer look and see if anything can be done at all. > > > Is there anything to add to the .rgd file? > > .rgd files are only relevant when you create a new device. It is the > .rg file that is driving things from that point on. It's the exact same > info, though. > > > But since the port number can change at each boot, or depending on the > > order in which the devices are turned on, maybe this is not a good > > method? > > I suspect that is what is really happening. There's a limit to what > we can obtain from the drivers. Therefore there is a limit as to how > good of a job we can do matching things up. > > > 3) And by the way, where can we find a complete manual about the xml > > format of .rgd files? > > You'll have to read the code. We've barely got time to write code > let alone documentation. Feel free to create some, though. We'd be > happy to post it to the wiki. > > Ted. > > > _______________________________________________ > Rosegarden-user mailing list > rosegarden-u...@lists.sourceforge.net - use the link below to unsubscribe > https://lists.sourceforge.net/lists/listinfo/rosegarden-user
