Some Details

I'm sure that y'all're getting sick of me putting in information just to have someone else add it, and for that I apologize.

HOWEVER, I bring great news!

1st) The colour of the violin seems to be based off of the primary colour of whatever gear you have equipped in your hands (including flashy). If you have no gear equipped, it will take the colour of the most recently equipped. I haven't tried using it immediately after logging in without equipping gear.

2nd) It seems to only play the songs on hand chimes (even if one has an instrument equipped when using chair),

3rd) Having an instrument and score scroll equipped does NOT affect anything (save for the instrument colouring the violin),

4th) Even without 'Repeat Playing Instrument' on, you automatically go to the next song.

5th) You cannot seem to fail the song, dunno bout inspiring performances.

6th) I just leveled up while sitting on it without anything else going on, dunno if that's useful information or if I overlooked something.

7th) Works to apply Great Mood in Festia as per usual; will not apply it elsewhere.

8th) There's a R-Click option to put a score scroll inside the chair while it's in your inventory, which will cause it to play that song instead. You can still only play with hand chimes, but you also still cannot fail. Score's durability will be used as per normal, autoplay is forced, and you cannot add another score before R-Click option 'Remove Score Scroll'.

About #6 did you level up due to sitting near the Festia Landmark? That gives a small amount of exp per second, and it could have caused you to level up.

Not something I was aware of; the former.