Help - upgraded from and old CbB, now some VSTs don't sync to fractional tempo (like 139.77 etc.)

[Jan]

So I've been running an old CbB from 2019.09 (build 70) for ages. No issues. I have a couple of projects that have unorthodox tempos, like 122.52 and 139.77 (remixes of some older tracks). They worked just fine in CbB. Upon learning that CbB will be dead soon I installed Sonar Free (2025.07 - 31.07.0.063) today, opened the project with a 139.77 tempo and the arps from Sylenth1, Vital, Spire and Kontakt are out of sync after a while. They are all VST2 but that might not mean anything (Diva has no issues in either VST3 or VST2 version). Once I change the tempo to an integer value i.e. 139 it all works fine, it's as if they ignore what's after the decimal point. I'm devastated seeing as the CbB is on its way out. As I said none of those problems ever existed on that old CbB that I had. I am able to reproduce this in a blank project.

Is this a known issue? Is there a magical setting that I can flip?

1. Those VST arps are definitely tempo synced

2. Sonar tempo seems fine, I have a 139.77 BPM audio track in there and it sounds fine (nothing that would indicate Sonar tempo drift, no glitching, no pitch change)

3. Tthe metronome stays in sync with Diva, but Sylenth1 clearly lags behind (I set up a simple quarter note arp and I can hear that the first arp note starts falling BEHIND the first beat of the bar after a couple of seconds). I exported this lagging arp to WAV and measured the bar in a wave editor - it's approx. 1.728 seconds which amounts to 139 BPM. So it looks like the .77 of 139.77 is truncated for some reason when going to Sylenth1. None of this happens in CbB from 2019...

Attached is an example project (created in 2025.07), not sure if it's of any use, and an audio export of the metronome at 139.77 and Sylenth1 clearly (well... when measured going at 139. I am able to open this project in CbB and it works as expected, everything is in sync.

(a friend of mine posted this on r/cakewalk subreddit as well)

sync issues demo.zip

[Noel Borthwick]

Well look into this next week and see if we can repro it.

[Jan]

2 minutes ago, Noel Borthwick said:

Well look into this next week and see if we can repro it.

Thank you very much, is there any additional information you need for me? Or anything I can try? I guess I could check the latest CbB although I don't really want to mess my current 2019.09 install up

I'm not sure when my CbB reactivation is due (sadly I think the last one was in February, so the next one will be days after Aug 1st), I wish I could force it now (is that possible?) so that I could get those extra couple of months until this bug is fixed. Otherwise I'll have no way of working on my project as I'll be left with a dead CbB and misbehaving Sonar...