The Tone Match block is literally black magic, imo.
Just remember that what you feed in to it is what you get out of it.
Case in point, I Tone Matched a 'Sultans of Swing' clip I found on YT that contained some parts where it was just Knopfler playing and using the TM block, correctly, I sounded pretty darn close to the studio tone I heard on the records.
But yeah knowing how to use it is paramount. It works best on isolated tracks with only guitar or bass and it helps if the track is in a very high quality.
I actually considered the fm9, my sole reasons for not getting it was the lack of tone match block alone, I think it is that good. It was awesome on the FX ll as well and is only better now.
Some tips I found on using it was to always use isolated guitars tracks no other instruments going, high quality stems/tracks works the best, don’t play the notes you "record" from the track when you record yourself instead play chords all over the neck to capture your entire soundscape, try to first get it as close as possible yourself by researching gear used like amps, cabs, speakers, ect and hold off on the effects until after you have tone matched and you are happy with the results. But most of all read the dedicated manual on the TM block and check out all the YT tutorials.
