[SOUND COLOR FX] does not work.

If the effect channel selector switch is set to [1, 2, 3, 4], the volume of the [NOISE] effect can be adjusted using the [TRIM] controls for the respective channels. If the effect channel selector switch is set to [MIC, CF-A, CF-B, MASTER], the volume of the [NOISE] effect is adjusted automatically by this unit, so it cannot be adjusted by the user.