Lining up MIDI clock with MP3 backing track

[go2ldook]

I am going to play with this today in terms of song auto-start and using the MIDI clock from Bandhelper to quantize loops. Wondering if anyone has done this?
The assumption here would be that a sequenced backing track mp3 will be perfectly at the tempo you created it in, and with automatic song start, would like up perfectly with Bandhelper's midi clock tempo.

Has anyone done this and are results good, or do you end up still a painful milli second off?