Guitar Pedal X - GPX Blog - Preferred Filter Pedal Selection - at the key practical enclosure sizes
Filter pedals that can use envelope to modulate LFO speed? | The Gear Page
Guitar Pedal X - GPX Blog - Old Blood Noise Endeavors's ingenious Float Dual Moving Parallel Stereo Filter takes the Filter Pedal Format to new heights
Amazon.com: Dr. Scientist Dusk Analog Low Pass Filter Effects Pedal : Musical Instruments
Macrodose™ Envelope Filter - AllPedal
FilterFX – 12dB/oct LP/BP/HP LFO filter with 8 waveshapes – Electric Druid
FilterFX – 12dB/oct LP/BP/HP LFO filter with 8 waveshapes – Electric Druid