We don’t have an FM3 in office to test with (only have got the AxeFXIII), but we have corresponded with some users via email who confirmed that bot the Tuner and Integration function works with the FM3. But then again, we also have some users who can’t get it to work - I’m not familiar with the settings in the FM3 that is required for the integration to work. Anyone knows?
On the AxeFX3, you just need to connect the MIDI OUT to MIDI IN and vice versa, and turn off MIDI Thru.