I think the next version of Overbridge which comes in February 2018 will solve things and make Sync Tighter…
Have you tried to set the SYNC OFF on Overbridge :
And passing ERM clock Midi Out to Analog Heat Midi in (and set in Analog Heat Sync Midi clock receive, transport receive)
?
Abletonsync with OB and the ER-M : To me it’s a non-sense, it’s not working like that. You have one Sync solution to choose, something to be the Master Sync and all the other equipment Slaved on it. If you not keep that in mind you will experiencing the worst … and it’s not what’s Sync is intended to do to yourself, it’s intended to make life better and not the contrary.
Your ERM must provide a Sync where everything is TIGHT. You have delay know on it to make everything in SYNC it’s up to you to set it up and make things works.
NB : You just have to set it up correctly. Hit records and shift things to get everything one by one in time. (you can help with the Ableton metronome) when everything is in Sync you forget Sync and work
Generally the Shift offset is usually in delay and not in advance because it’s the time for the audio to be recorded by the soundcard/computer you delayed it to match your DAW Grid
Do the same with your Analog Heat by setting a filter with LFO synced to the BPM you normally find your sync offset with something highly noticeable regarding the modulation depth it’s must be something rhythmic and kind of huge so it will be easier to find the appropriate amount of Shift offset on the ERM
Also if your LFO phase in not perfectly on Beat you may have difficulties to set it up i would choose a SQUARE or something more abrupt just to set it up you SHIFT when you find it you can do whatever you want.