Digitally controlled mute circuit

The mute circuit presented here Is specially designed for use with the Roland MT32 module, although with some small alterations it should be suitable for use with other makes of expander er synthesizer. lt is intended to eliminate the noise that the expander produces after a note-off. This noise, which rernains audible, becomes pretty irritating after a while when the expander is used at home. For studio use a noise gate is, of course, used.