Using MIDI instruments to create Audio tracks

I’m using Ardour 8.6 and I would like to create an audio track that gets its sound from the track that is powering AFluid triggering a SF2 sound.

I was able to do it (bounce a track and fix the tempo) but I think there must be a better way.

I’ve never been able to get a midi track that reliably records and plays back in tempo, also not sure why but I have good sound banks I’ve downloaded and would like to get my phrasing into the tunes I’m creating with out having to go back and manipulate the midi to make it work.

Thanks!