Tracks out of sync multitrack

DickyDutch

Hi Peter - Played at a gig this evening. I’d been playing for about an hour and decided to play one of my latest multi track files. The result was disastrous - the tracks were so out sync that I had to stop it and continue with just me playing guitar as backing. I’d previously played the song at home many times without any problem. I’m now nervous to include any multi track song at a live gig in case the same thing happens. All tracks were mp3 320 files.

peter

Which samplerate are the files in? 48kHz?

DickyDutch

Not sure at the moment- will check tomorrow and let you know

DickyDutch

Have played same song this morning and it plays no problem! The song comprises 6 tracks with iPad set to buffer size 2048. All files were exported as WAV files from Cakewalk at 44.1khz 32bit. They were then converted to MP3 at 320 Kbps before loading to STAGETRAXX.

peter

That's not good. I will try to find a workaround for these problems. If I can solve this, changes will most likely be quite complex so I will definitely release these changes as a beta version first to make sure that it does not ruin the stability for stereo tracks.

DickyDutch

For information I just created a new multi track song comprising 6 tracks. The files were exported from Cakewalk as 320 Kbps MP3 files then loaded into STAGETRAXX. I’ve had to open and close STAGETRAXX three times before the song eventually played in sync! I just played it again whilst writing this - the first time all good - the second time it’s out of sync - something strange going on!

peter

After about a week of rewriting the audio engine multiple times I can report a bit of success. I managed to remove the crackles in 48kHz tracks. I also improved the sync issues quite a bit. But from time to time playback still manages to get into a state where it is slightly out of sync. Although it is not as much out of sync as before. The downside is that the engine now uses a bit more cpu. Before these changes the cpu on my iPad was running at about 15% load and now it is about 20%. This will affect battery life a little bit.

I still need more time tweaking and testing before releasing a beta version.

Jb6767

Is it that we are asking too much of the software . I mean iPads are limited to capacity and processing.

peter

I have just submitted a beta version 3.4.9 to Apple. It is currently in review and should be available shortly in Testflight. Here is the invitation link in case you need it: https://testflight.apple.com/join/pq4xbzSq

Please try out normal playback and also multitrack playback. On my device the changes have improved stability a great deal. Crackling is gone completely and sync issues are mostly gone. I say mostly because with heavy testing I sometimes get identical tracks to flange slightly which means a couple of samples offset. But this is only noticeable in test tracks.

peter

Review is taking very long this time. I thought it would be reviewed in a couple of hours but it seems it can take multiple days 🙁

Jb6767

Peter, thanks so much for working on this so much. It is nice to see someone backing a product and this type of service and response is what separates good from great.
I have been beta testing and it seems to be good on my end.

peter

Version 3.4.9 beta is still waiting for review. It is not available yet in Testflight. Seems like the review team at Apple is not working on Thanksgiving weekend.

peter

Today 3.4.9 was released. It is now available in Testflight. Please try it out.

metomet

ST 3.5.6

still have a problem with the sync between audio (same result with 44.1 / 48kHz) tracks in a multitrack song
(not always, but quiet often)
(lyrics only song) lyrics are going out of sync (sometimes) when ST goes to background while playing the song

iPad Air 2, latest iOS

peter

Sorry to hear that. Is there a way to reproduce these problems? I don't see any issues on my end with version 3.5.6.

metomet

peter I can send you the song/songs that cause the issue and maybe you can reproduce/look at it. Tried an only lyrics song and used midi to start multitrack playback from another app - all good. It’s strange that once it’s ok and the next time out of sync.

peter

Yes, please send it to support@stagetraxx.com. If you have a configuration where this issue can be reproduced. Please send me the track causing this issue and the 2 tracks you played before. I also need info whether you used autoplay and possibly crossfades.

metomet

peter I just tried with few more songs...the same result. In general, no problem till the second track, but then after the sync is going to fail (not aways). I don't know how to send you a song, but it happens with all multitrack songs I created yesterday and today too. They are mix between stereo and mono files. No crossfade, NO autoplay.

metomet

I just sent you an Email with attached audio files. Please, try to build a multitrack song with them so we can see the result? I alway put Drums first, Bass-2, e.piano-3, then Gtrs left and right to 4 and 5 if that matters!

peter

I did not receive an email. I also checked my spam folder.

What file format are you using? And what do you mean by "after the sync is going to fail"? What sync? And how exactly does it fail?

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