Midi goes out of sync/time

Freex


Hey Guys
 
I tried recording some drums the other day as an experiment, using real cymbals and a electronic drum kit to trigger a midi plugin.
The audio recordings are all fine and in time with the click and each other
But the midi starts the lose time slowly over the lenght of the take. starting in time at first but slowly losing time (slowing down) as the take goes on.  By the end of a thre minute take it sound like someone that has know idea how to play a kit. (very funny)
 
Has anyone else experienced this or found the cause or a cure.
 
Thanx for the help in advance.
 
Freex

Freex


Hey Guys
 
I tried recording some drums the other day as an experiment, using real cymbals and a electronic drum kit to trigger a midi plugin.
The audio recordings are all fine and in time with the click and each other
But the midi starts the lose time slowly over the lenght of the take. starting in time at first but slowly losing time (slowing down) as the take goes on.  By the end of a thre minute take it sound like someone that has know idea how to play a kit. (very funny)
 
Has anyone else experienced this or found the cause or a cure.
 
Thanx for the help in advance.
 
Freex

Freex


All the tracks were staight to sonar via my FS2626, (Mics for the cymbals ofcourse, and midi out from drum brain into FS2626 midi In) the audio is perfect and in time (good drummer) the midi is off.

I've had a bit of a tweak and I've found that by using "fit to time" on the midi clip (shrinking the clip) from 05.54.28. to 05.54.17 (that's mins, secs and millis btw) I've got it almost back into time so the midi must have linearly gone out of sync, just a fraction at a time which eventually ends up being alot. So in total over the space of just less than 6 mins I've gained approx 0.1 of a second on the midi (I don't have a flux capacitor so we can rule out time travelling midi). It's crazy that such a little amount can sounds so ridiculously dire.

I think I should be able to salvage the takes but I'm stumped as to the cause.

Freex


Not sure you're getting the problem, the midi starts at the correct place (timestamp is correct) but final hit of midi is approx 100ms after the final hit of audio.

bvideo


The timestamp & clock drifts theory is that when Sonar was recording, there was a timestamp mismatch between the MIDI clock and the audio clock. Then on playback recorded audio and MIDI would not be in sync. If your MIDI driver is timestamping based on the PC's time, but the external audio clock is .03% different from the PC's clock, this could happen. Also, check that Sonar's sync setting is "audio".

Take a look at IgnoreMidiInTimeStamps=<0 or 1> in the manual (for TTSseq.ini):

This line determines whether or not SONAR ignores

any MIDI time stamping that a MIDI driver does. If

you’re experiencing increasing delays between the

time you play a MIDI note on a controller and the time

you hear SONAR echo it, setting this line to 1 may

help. Also, if you find that SONAR is recording MIDI

data at a different time from when the data was

played, setting this line to 1 may help. If the MIDI

driver is using a different clock from SONAR, the time

discrepancy increases the longer that the MIDI driver

is open, so you need to tell SONAR to ignore the

timestamp that the MIDI driver adds to the data (set

the value to 1).

Note that this setting is needed during recording. Playback is too late.

Another case could arise from slaving the drum machine to Sonar's midi clock, but Sonar is not sync'ed to the audio clock. Then Sonar is generating MIDI timestamps and tempo from the PC's clock but recording audio samples at the rate of your Firestudio's audio clock. It sounds right during record, but not on playback.

Flywheel


Freex I think we understand we are all singing from the same hymn sheet, although we started of in unison we seem to be drifting. Others only sing when they want until we all grind to a sudden stop if we let it continue.


As I said i hope Cakewalk have picked up on this erroneous error of computer programming and has concocted some penicillin to amend it and call it a working remedy called X1D! The medicine!

Peter Morrison

My problem is different I have suddenly developed a big latency problem during recording. My friend had a similar problem on his Mac using Pro Tools. When he played his keyboard the latency delay was fine, but the Midi data went down late. He found out it was a Drumagog issue. When he disabled Drumagog, the sympton stopped

 
 
 

evzevz


For what it might be worth, I have had problems with midi synchronization when using instances of Perfect Space and low latency settings. Even with the perfect space instances disabled the problem persisted. I think the solution lay in fine tuning the buffer sizes and latency as CJ mentioned, but I went the fast route and just removed perfect space from my projects. Have you tried a test project with nothing else in it?