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Re: [Lmuse-user] midi sync
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From: Robert J. <rj...@sp...> - 2006-12-26 22:49:33
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Hello Allan, and happy holidays to y'all. Yes, it's interesting information and I'll keep the mail for later (some would argue it's already later) when I have time to review and test some more. Regards, Robert On Sunday 10 December 2006 23:18, Allan Klinbail wrote: > Hi Robert, > > My apologies I have done some final testing and found that having both > mtpav driver and snd-usb-audio driver both loaded were having an impact > on the results, even if only one was assigned in MusE at a time. The > results were also skewed by changing displayed tick resolution values > which appears to be a bit more buggy than first reported. > > Further testing today was done, where I completely isolated the two MIDI > sync input sources the results were better but there are still some sync > in issues. Most of the problems I have seen appear to be related to the > mtpav driver. > > snd-usb-audio > Running with snd-usb-audio alone gave almost perfect sync in and out. > Sync out: The external sequencer followed MusE perfectly to the tick. > Sync In: MusE seemed to drift by a small number of ticks over 36 bars in > 4/4 timing (greater or less than 20 ticks) > This isn't conclusive as the displayed tick value doesn't seem to > change. It counts in increments... After changing this value then MusE > seemed to display erratic behaviour and also jackd started exiting. The > erratic behaviour didn't occur when leaving the displayed ticks at the > default 384 but the drift was still apparent. > > snd-mtpav > Sync Out: The external sequencer would respond to MMC continue and stop > but not maintain positional sync with MusE when using the MusE > transport. > Sync In: didn't work at all > > Conclusions: > MusE still has some slight drift on sync in and there are bugs related > to the displayed tick value settings. I will put all my findings in a > bug report shortly. > > ALSA mtpav driver is buggy - I have discussed this on the alsa mailing > list, but will register a bug report with them also. > > I hope this is of some use. > > cheers > > Allan > > On Fri, 2006-12-08 at 02:12 +1100, Allan Klinbail wrote: > > Okay > > > > No other sequencer I can fins seems to have external sync anywhere near > > as implemented as MusE, so I can't really determine if this is MusE or > > the driver, unless there is some debuggin in fo I can turn on > > > > cheers > > > > Allan > > > > On Fri, 2006-12-08 at 01:50 +1100, Allan Klinbail wrote: > > > Thanks, > > > > > > This is good to know. I've noticed some odd behaviour with sync after > > > previous and now this release, which seems to be related to previous > > > stop point. > > > > > > I think I have noticed new sync input issues as well, but it may be > > > alsa related, as they only seem to occur when I use the mtp-av, but > > > could be MusE because I've seen similar behaviour before that was fixed > > > by changing the MIDI clock input port settings, but itsn't occurring > > > now. > > > > > > The behaviour I've seen is that when devices that have internal clocks > > > connect in addition to the external sequencer that MusE skips bars and > > > misreads time. This is occurring when the other devices are not sending > > > their own clock signals. > > > > > > This is occurring with a > > > > > > An MPC-2000xl in master mode > > > MusE in slave mode > > > Yamaha AN-200 set in slave mode, > > > edirol pcr-30 with the clock turned off (it doesn't slave but has a > > > clock that can be turned on if using as a transport controller) (with > > > MIDI out connections to the MTP-AV) > > > MTP-AV using alsa driver > > > > > > I was able to get sync in one specific condition, > > > block sync signals coming out of the an-200 with the MTP-AV and > > > removing both MIDI cables connecting the edirol to the mtp av. > > > (blocking the signal with the MTP-AV had no effect on this at all.) > > > > > > This only occurs with MusE syncing in and not out. > > > > > > I noticed this quirk a while ago without the mtpav involved in the > > > past. > > > With the PCR-30's clock off MusE was not keeping sync with the MPC-2000 > > > until I selected a discrete input for MIDI clock, even though there was > > > only one device sending a signal. > > > > > > I am now going to test to see if I can duplicate this behaviour on > > > another sequencer to help determine if it is MusE or the driver. > > > > > > cheers > > > > > > Allan > > > > > > On Thu, 2006-12-07 at 08:57 +0100, rj...@sp... wrote: > > > > Hello Allan, > > > > > > > > Allan Klinbail skrev: > > > > > Hi, > > > > > > > > > > In an all hardware setup (synths and controllers are all external > > > > > devices) I am not getting any shift of the controllers. It all > > > > > seems to working quite tightly. > > > > > > > > Ok, good to know. > > > > I have been researching this myself and I have not found any issues > > > > during playback. > > > > > > > > Moving the playhead while stopped does however still have issues. > > > > Moving, deleting and copying parts leaves a trace of controller > > > > events that are output when the playhead is moved. I'm researching > > > > how to fix this. > > > > Restarting MusE should mostly get things on "track" again. > > > > > > > > Regards, > > > > Robert > > > > > > > > > cheers > > > > > > > > > > Allan > > > > > > > > > > On Thu, 2006-12-07 at 04:58 +1100, Allan Klinbail wrote: > > > > >> Speaking of tomorrow .. I'll try on a true hardware synth setup > > > > >> tomorrow. > > > > >> > > > > >> cheers > > > > >> > > > > >> Allan > > > > >> > > > > >> On Tue, 2006-11-28 at 23:01 +0100, . wrote: > > > > >>> On Tuesday 28 November 2006 16:56, rj...@sp... wrote: > > > > >>>> Oh, experimental synth? hardware or software? :) > > > > >>> > > > > >>> Softardware :) It's a hybrid digital/analog system using LADSPA > > > > >>> oscillators from the CAPS suite for the "vco", the modulators > > > > >>> (lfo/env) are made with PureData then send thru a DIY hispeed > > > > >>> digital->CV convertor (32 channels) to modulate a bunch of *real* > > > > >>> analog VCF and VCA. I have cloned various famous VCF > > > > >>> (Moog/SEM/KorgMS20/Synthacon). :)) > > > > >>> > > > > >>> Then all this is aquired by a Terratec EW88mt using ardour and > > > > >>> MusE. > > > > >>> > > > > >>>>> But i think this report may interest u :) > > > > >>>> > > > > >>>> Yes it does. > > > > >>>> The change you mention below is I think the only change made > > > > >>>> that could affect this... not entirely sure what is going on. If > > > > >>>> you have more info please send it. > > > > >>> > > > > >>> I will, i observed a curious behaviour like each time the loop > > > > >>> started again it changed the value of a midi controller :) > > > > >>> > > > > >>> Now, it seems to work ok but all the "controller" parts have been > > > > >>> moved to bar 2. Tomorrow will be another day :) > > > > >>> > > > > >>> Cheers, > > > > >>> > > > > >>> NR > > > > >>> > > > > >>> > > > > >>> > > > > >>> > > > > >>> > > > > >>> > > > > >>> > > > > >>> ----------------------------------------------------------------- > > > > >>>-------- Take Surveys. Earn Cash. Influence the Future of IT > > > > >>> Join SourceForge.net's Techsay panel and you'll get the chance to > > > > >>> share your opinions on IT & business topics through brief surveys > > > > >>> - and earn cash > > > > >>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CI > > > > >>>D=DEVDEV _______________________________________________ > > > > >>> Lmuse-user mailing list > > > > >>> Lmu...@li... > > > > >>> https://lists.sourceforge.net/lists/listinfo/lmuse-user > > > > >> > > > > >> ------------------------------------------------------------------ > > > > >>------- Take Surveys. Earn Cash. 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