Four-channel analog Expander/Gate/Ducker. The Samson S-gate 4 can operate as four discrete gates or as two linked stereo pairs. It employs two selectable filters for frequency-dependent triggering to deliver precise, fast, and sonically subtle dynamic control. Each channel includes threshold, attack, release, and range controls, plus an eight-segment gain-reduction LED indicator. Ducker, Link, Key Listen, and in/out routing switches add versatility for studio or live use.