Turning off the LFO->tuning modulation made a perceptual difference to me as well, but it sounds like something else must be going on though. Just with what's in the patch, it does sync here and stays in sync for several minutes, which should rule out some things, I guess.

Sounds more and more like accidental midi-learn.

Do this...

@iamyourfather

If you have a SoundCloud account, you can get Ableton Live 8 Lite for free now. At least you could test your patch in Ableton using the Lite version.

http://www.ableton.com/get-free-live-lite?sn=57FE-CC4A-D1DC- 8EC9-896F-7925&utm_source=sc-free-lite-mailing&utm_medium=em ail&utm_term=sc-free-lite-mailing-b&utm_campaign=free-lite-f or-sc
[/url]

// Global MidiCC Map


1=PCore:X_1 //Core:X1
69=XMF1:Cut //XMF1:Cutoff
71=XMF1:Res //XMF1:Resonance
72=XMF1:XFM //XMF1:FilterFM
73=XMF1:FOff //XMF1:FreqOffset
84=OSC1:WNum //Oscillator1:WaveWarp

I thought I'd let someone have a peep before I just go on and erase it

OK not sure what's going on. I deleted the midimap data and the patch still won't keep time, however a new test patch I made does keep time as does the HS Flapper preset from the factory bank. I guess I can just go on and remake what I originally wanted to do as it seems ok. Not sure how any of the data listed in that midimap .txt would affect the timing tho... if at all.

Still thanks for your help chaps.

You could double click all the mseg source and destination knobs to reset them to zero. It's possible you used shift+mouse to add a tiny bit to one of the knobs and that will add up over time. It's also really hard to see by just looking at the little knob arc.

Sadly the issue is not fixed at all. I just loaded up the SM LFOed XY preset from the factory bank and it was all over the place. It simply is NOT an issue of error in my patch creation... I really wish it was.

Could Urs please take a look at this as it's really cramping my style. Thanks.
IAYF

How long do you hold the notes?

The MSEGs may run out of sync after 30 seconds or so, and mostly if Swing is used. I've tried to wrap my head around this, but the only possible cure is to not Swing the MSEGs at all.

There's no swing applied and the longest notes held were maybe 8 beats at 145 bpm. It doesn't so much drift out of time so much as randomly start off each note in and out of time. It sounds more like the envelope start point is being applied with some random factor involved. I will see if I can get an mp3 together of an example to give a better picture.

Thx Urs

OK ... here's an mp3 showing the timing in the simplest possible form just a gated saw against a kick and hat. I used repeat notes of 8 beats in length, you can hear that the timing accuracy seems to come in discreet chunks suggesting that the start time of the mod envelope is hitting at a different time for each note. At least that is what it sounds like to me.

http://www.box.com/s/81b26c45e11c5068d681

Also here's the patch I used to generate the saw / gate

http://www.box.com/s/f8423a55444804486fae

Thanks, IAYF

BTW sorry the mp3 has some weird glitches in it, I recorded the file to wav in reaper first tho so it's nothing to do with the issue

the end point for MSEG1 in the patch you posted wasn't on beat. Try this...
http://www.3amnoise.net/noise_strobe-fix.h2p

good grief, how dumb do I feel right now. Dunno how it happened with presets but I can only assume that I touched something and did not realise. Thanks to all for sorting this out for me. I can only apologise for my error and you wasted time.

You guys are simply brilliant

No problem, dude. Glad it's all worked out.

Gah - I should have caught that myself