The PC4K S-Type Expander/Gate from Cakewalk is a plug-in module that adds expansion and gate functionality to any ProChannel strip in SONAR. Based on the vintage-style channel expansion used on large format studio consoles, expansion can add dynamics back to overly compressed material. Add life to vocal tracks, put punch back into drums and drum loops, and much more.

The gate can be used to remove unwanted sounds between individual drum hits, for example, or any similar type situation. Another use of the gate is to lock certain tracks together, such as a bass guitar that should only sound with the kick drum. The bass guitar track accepts a sidechain input from the kick drum track and only sounds when the gate is opened. The bass sustain can then be further adjusted using a release control.