BPM fluctuating in Midi Clock: Slave mode

[Leaozinho]

I am trying to sync my P12 with Ableton's clock but the BPM always fluctuates when I start the clock in Ableton, making it very difficult to get a good sounding recording.  I've searched the forums a lot and have seen a lot of similar behavior with the REV models and different DAWs (especially Logic).  I'm wondering if anyone has experienced similar behavior or has found a solution.  I tried switching from a USB connection to a MIDI cable and still get the same behavior.  Thank you for your help!

[standingwave]

Hey,
 It sounds like you're experiencing MIDI jitter. Computers are notoriously inaccurate with external MIDI clock output, especially when it's trying to compute multiple things at the same time.
 I tightened up my system with the Expert Sleepers USAMO. It converts Audio to MIDI though a plugin that lives in the session. Before that, I had the same issues, but that little device fixed it up lickitysplit.
 Cheers.
PS- a link to the device:
https://expert-sleepers.co.uk/usamo.html