Polisher

Polisher is a signal conditioning plugin built around a single idea: your audio should be pristine before it reaches your first compressor, EQ, or effect. One control — Polish — handles three problems at once, invisibly, with no configuration required.

A Goertzel-based hum detector listens for a few seconds, identifies whether your environment runs on 50 Hz or 60 Hz mains power, then locks narrow notch filters onto the fundamental and first two harmonics. A rumble filter clears sub-sonic noise from handling and room vibration, and a transparent auto-leveler keeps takes consistent without any pumping or colouration.

The What's Happening panel gives you a live readout: detected hum frequency, rumble status, and whether the leveler is idle or correcting. Turn Polish up and let it run:

• Automatic hum detection & removal - Goertzel algorithm identifies 50 Hz vs 60 Hz mains and places notch filters on the fundamental and first two harmonics automatically.
• Rumble filter - Removes sub-sonic noise from handling vibration, cable movement, and room resonance before it colours anything downstream.
• Transparent auto-leveler - Up to ~1 dB of smooth gain correction keeps takes consistent without the artefacts of fast compression.
• "What's Happening" display - Live readout of detected hum frequency, rumble filter status, and leveler activity so you always know what's working.
• One-knob operation - Turn Polish up; all three modules scale together. Bypass for instant A/B. Full preset system included.