The Boomstick Audio Devices Bottom Feeder filter is the bass version of the acclaimed Mojo Hand Analogue Filter 442. Based on the same circuitry as the original DOD 440, but with a wider frequency range for bass guitar and baritone players.
- DOD 440 Envelope Filter
- Alpha Omega Four 40 - Envelope Filter
- General Guitar Gadgets DOD 440 Envelope Filter Replica
- Tone Factor 442 Analogue Filter