void set_gain(unsigned bus_idx, float value) override;
void set_compressor_threshold(unsigned bus_idx, float value) override;
void set_fader(unsigned bus_idx, float value) override;
+ void set_fader_absolute(unsigned bus_idx, float value_db); // Used by the theme only.
void toggle_mute(unsigned bus_idx) override;
void toggle_locut(unsigned bus_idx) override;