Chord symbol playback does not respect Mixer soundfont change

Repro:
0) Ensure chord symbol playback is enabled.
1) Create any score with any instrument.
2) Fill a bar with slashes.
3) Place chord symbols above slashes.
4) Open the Mixer and change the instrument's soundfont to anything.
5) Play the chords. Notice that the chords still use the old soundfont.
6) Open the Inspector on a chord symbol and change its voicing (e.g., from Auto to Root Only). Notice that the new soundfont is now used.

Let me know if you need other details. I'm not a C++ dev but I can try to poke around the code and see where there's a failure to publish/subscribe to this change.

Best,
Oliver