Recorded Tracks not synchronised

[Yarnall]

Yes, JamKazam intends to mix the original tracks together.

And it is correct that the function worked in the past.

Until 6 months ago, or so.

But it is also correct that the function is working again now.

In the last 6 hours 9 recordings have been finished by the server mixing.

See for yourself in VIEW THE FEED

Just to get back to my original question: I am not interested in any of the mixes JamKazam makes, I will mix myself, but I would like to know how JK knows how the files sync, because looking at the files I cannot find a way  to do this other than by trial and error.

Alternatively, perhaps someone can think of a method to leave a sync mark in the files? Normally, when sound from one track bleeds into the other tracks, one could just click or clap to make an audible (and visible in the waveforms) sync mark. But because when recording in JK the tracks are completely separate in their audio content, I cannot think of an easy way to get a click or clap into all tracks simultaneously.

Or is this delay between the tracks a fixed value? (Again, I am not talking about the latency when playing together, which in our case is around 20ms. But the delay between the tracks is around 250ms, caused by the recording not starting (and stopping) at the same time. The recordings are also not the same length, the difference, however, is much larger than the delay, probably around double, but I don't think it is consistent.

Any tipps appreciated.

Maybe something as simple as starting each recording by getting a band member to count 1, 2, 3, then everyone plays a single note on their instrument, or claps their hands if they are using a vocal mic. It should be fairly easy to line up these single instrument hits and hand claps in a DAW so that at least the start of the tracks were all lined up (just like using a clapper board).

If there is significant drift in the tracks, this could be repeated before each song.

Hi Johannes, et al. - 

I have had exactly the same problems when "exporting" the master tracks to do my own mix (two musicians only, piano and bass). Our tracks are about .2 seconds out of sync (NOTE that this does VARY from song to song). And I agree with all that Johannes has said in terms of troubleshooting and analysis -- there must be a way for JamKazam to fix this automatically (and hopefully in an imminent update they will do so!), but in the meantime we must fix this manually. 

One CLUE is that when I (the bass player) export the high-res files to my Mac for mixing, it is the piano player's track that is delayed by about .2 seconds; however, the reverse is true for the piano player -- that is, when he exports the hi-res files to his Mac for mixing he sees/hears my bass track as being about .2 seconds behind. Not sure what this suggests, but it must be a clue to why/how this is happening!

What definitely DOES WORK as a solution for us (for now, until JamKazam fixes this) is essentially the same as this idea suggested earlier in this thread (a version of the "clapper" idea also referenced in this thread):

• Maybe something as simple as starting each recording by getting a band member to count 1, 2, 3, then everyone plays a single note on their instrument, or claps their hands if they are using a vocal mic. It should be fairly easy to line up these single instrument hits and hand claps in a DAW so that at least the start of the tracks were all lined up (just like using a clapper board).
  
• If there is significant drift in the tracks, this could be repeated before each song.
  

This is essentially what we do, and it works. At the beginning of each recording I give a voice-chat count-in of "1,2,3,4" after which we then we both play four clean notes in that same tempo (four taps on my bass body, four sequential high notes on the piano) in tempo with that count. NOTE that this count-in does not need to be in the same tempo as the song to be recorded; it is only being used for the sync.

Then when I export and open the files on my Mac (in a great $50 program called Sound Studio) I do the following:

1. I first open the Stream Mix in Sound Studio and listen to and look at the wave form for the count-in section.
   
2. I determine which of the four "hits" (taps/notes) is most in sync. Usually all 4 are almost perfectly in sync; but due to human error (the same as would occur in a room together, nothing to do with latency, etc.) some might have a very slight flam.
   
3. Let's say I determined that the third "hit" was the best.
   
4. I then open the hi-res version of the piano and bass tracks and merge them into one audio file (each on their own track) in Sound Studio so that I can see/hear both together (but again, with each residing on its own track within that file).
   
5. I find the count-in section on the bass track and drop in a marker right at the start of the third hit of that bass track. I then drop in a marker right at the (delayed) start of the third hit of the piano track.
   
6. I measure the distance between these two markers. Let's say that distance is .2145 seconds.
   
7. I then just delete .2145 seconds from the beginning of the piano track. This $fts that piano track back by the amount needed to cause the attack of the two most synced "hits"(on bass and piano) to align exactly.
   

This works 100% PERFECTLY every time!
It sounds complicated, but it really takes only about a minute or two to do all of the above. 
YES, it is a pain -- and JamKazam should do this automatically. But until they fix this bug this workaround will work!