Hello everyone, i had this problem for a bit and i think it should be took in consideration by Ableton team, the recent updates didn't solve it.
The fact is, APC 40 automatic mapping on "Device Control" doesn't work and produce a "jittering" in the eight knobs, however if you map directly one of them (or all of them) it works perfectly, so it isn't an hardware problem, but i think is like a "midi protocol" problem.
What i've observed is that the MIdi In and the Midi Out indicators flash together when one of this knob are rotated (with the automatic mapping) maybe creating a sort of over-write of messages, when you manual map one ONLY the Midi In indicator flashes as it should be.
The behaviour is explained pretty well in this video https://www.youtube.com/watch?v=d_ejCOcRKQA
Please fix the APC 40 Jitter Knob problem
Re: Please fix the APC 40 Jitter Knob problem
What the Hell is wrong with Ableton, this problem has been known for 6 years!!! unacceptable. Its still present in the latest Update.