Ableton trigger Lyrics in Stage Traxx

Hi all, using Ableton for multi track playback but can’t figure out how to get ST to display scrolling lyrics. I send song midi triggers from Ableton to ST over rtpMIDI, it loads the correct song on ST but doesn’t play it – so the lyrics don’t scroll. Is both ST song selection and playback start via MIDI from Ableton possible?

Also, the only reason I’m still using Ableton is cause I need to mix one audio channel on the fly on stage via midi expression pedal (mapped to the relevant Ableton channel fader). Can individual mixer faders in the upcoming ST V4 be controlled via midi? If so I’m done with Ableton!

Any advice appreciated 👍