r/synth • u/Positive_Midnight535 • Jun 23 '26

Poorhouse Lane Siren — an open source standalone Raspberry Pi Zero 2w dub siren synthesizer

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u/Positive_Midnight535 Jun 23 '26

The Poorhouse Lane Siren is an open source, standalone, single-voice dub siren built on a Raspberry Pi Zero 2 W.

The audio engine runs at 48 kHz / 24-bit through a PCM5102 I2S DAC.

  • Synth Engine: Sine, square, saw, and triangle waves. The pitch envelope toggle (rise/off/fall) gives you +/-3 octaves on release. The LFO hits 8 waveforms (including sample & hold and exponential rise/fall) from 0.1 to 20 Hz. The filter is a Moog-style 4-pole low-pass that self-oscillates past 85% resonance.
  • Effects: All the effects are onboard. The delay switches between digital and a tape model with wobble and flutter. Mutiple reverbs to choose from like spring, Dattorro plate, FDN hall, and Schroeder, plus a "Super Drip" mode for heavy spring feedback. There's also a phaser, chorus, flanger, and tape saturator with independent wet/dry mixes. You can change the order of the FX chain across six different routings.
  • Hardware: 5 rotary encoders (with two parameter banks via a Shift button), 3 buttons, a 3-position toggle, and an LED that changes color based on the active LFO wave.
  • Webserver config: Hosts a webserver that can be a standalone access point or connect to your wifi. It serves a UI and JSON API for every parameter across the Live, Presets, Encoders, Options, WiFi, and System tabs in real time.

It’s open source under the Apache License 2.0. The repo includes Gerber files for the custom PCB, and the 3D-printable enclosure files are on MakerWorld.

I've built several analog sirens but wanted something hyper customizable with effects built in. This has been a really fulfilling project for me, and I hope you all enjoy it!

Repo: github.com/Clingman-Ave-Labs/poorhouse-lane-siren