This is a different device (mk2) but I figured setup would be the same.
In his video, he does not change the Control Surface input in Ableton, so I imagine that is not necessary for Bome but I am uncertain. Couldn't get it working even with CS input change to Bome's output.
First you need to set up Ableton Live as shown in the first screen shot below. If Ableton also has APC40 MKII listed as input and output in the top box, disable it. You should only be listening to BMT 1 and sending to BMT 1.
Then use the attached file. I've set up fader 1 for you already. Add additional translators for any other faders.
Oh and make sure your inputs are defined at the preset level for incoming only from APC40-MK2 and output for only BMT 1. I would do this at the preset level and then all faders under that preset.
I also created a file below with the preset inputs and output set and a different methodology (scaling) to make the fader smoother through the whole range.
See attached.
New rules are
qq=pp*109
qq=qq/128
the output is set to qq.
Steve Caldwell Bome Q and A Moderator and Independent Bome Consultant/Specialist bome@sniz.biz