Choice setting that lists all 16 EQ slots — 6 read-only factory
presets and 10 user-custom slots — by their getEQFriendlyName,
with "(factory)" tagging the read-only ones. Selecting calls
setActiveEQ to switch which slot drives live audio. Activation
works for any slot regardless of writability; the read-only
distinction matters only for band edits (not implemented yet).
Placed directly above HeadsetAdvancedEQ in SETTINGS so the picker
sits above the band-display panel that reflects whichever slot is
currently active.
After a successful write, drop the AdvancedParaEQ panel's cached
_value so the next read pulls the new active slot's bands. The
visible band update happens on the next refresh of that panel —
auto-redraw on selector change would need UI-side plumbing we
don't currently expose; manual refresh / panel reopen works for
read-only verification.
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