Waves C1 Compressor is a uniquely versatile dynamics processor that combines a full-featured compressor/limiter and expander/gate in a single plugin. The built-in parametric sidechain EQ enables frequency-dependent compression — perfect for de-essing, ducking, or taming problem frequencies. Split mode allows independent compression and expansion processing on different frequency bands, while Key mode enables sidechain-triggered gating and ducking for rhythmic effects and broadcast-style voice processing.