Bring the '70s back to your board! The Electro-Harmonix Nono Q-Tron is a classic-style envelope filter that's right at home on a wide range of instruments.
Add some funk to your playing with this pedal! EHX added an effects loop and a fast/slow attack switch to the Q-Tron envelope filter to create the Plus.
The Spatial Delivery V2 delivers three modes of voltage-controlled envelope filters, which can be cross-faded for a range of sweeping auto-wah-style effects.