setEqualizer

Sets the ten-band equaliser. EqualizerSettings.Flat turns it off.

Flat is not just neutral, it is free: the filters are skipped entirely rather than run with coefficients that happen to be the identity, so a player nobody has equalised pays nothing.

A change swaps coefficients at the next buffer. The one buffer of transient that costs is inaudible, and interpolating twenty coefficients per sample to avoid it would cost more than the filter does.