Drawmer Dual Gate DS201 in great shape, only ever used in my smoke and pet free studio.

The Drawmer DS201 Dual Noise Gate is an industry-standard, 2-channel analog noise gate designed for professional audio production and studio mixing.

Key Features

• Frequency-Conscious Gating: Built-in variable high-pass and low-pass filters let you trigger the gate using only specific frequencies of a signal (such as opening a snare gate only on low-frequency thumps). 
• Ultra-Fast Attack: Responds in microseconds to preserve the natural transient punch of drums and percussive instruments.
• Comprehensive Envelope Control: Features dedicated adjustments for attack, hold, decay, and attenuation range. 
• Gating and Ducking Modes: Operates as a traditional noise gate or as a ducking processor for voice-overs and rhythmic keying effects.
• External Key Input & Listen: Allows external audio sources to trigger the gate, with a "Key Listen" mode to monitor the sidechain filter path.