pho

Passive quad mute module

Pho

Pho is a super compact and affordable 4HP quad mute module designed for maximum simplicity and hands-on control. It features four latching push buttons that directly connect or disconnect input and output jacks—ideal for muting trigger or gate signals on the fly.

Each channel is completely passive by default. Optionally, you can populate a power header, four resistors, and four LEDs to add visual feedback for the mute state of each channel.

Note: Since the switches are directly in the signal path, using Pho for audio will produce clicks—it's primarily designed with gate/trigger muting in mind.

Features

• 4 latching mutes in just 4HP
• Passive by default — no power required
• Optional LED indicators with minimal components
• Great for muting gates, triggers, clocks, or CV
• DIY-friendly, minimal parts count

Simple, cheap, and effective — Pho is a useful utility for any Eurorack setup.

https://wgdmodular.de/module/pho/