The Soundblox Pro Bass Envelope Filter is an evolution of its hugely popular predecessor, the standard Soundblox BEF. As before, there are 22 different envelope filter effects to choose from including 2 Pole and 4 Pole Low Pass variations, Single Peak, Triple Peak, Peak/Notch variations, as well as Phaser settings. Each of these settings can be further modified with a variety of control options including positive/negative filter sweeps, sweep range, attack and decay speed settings, or frequency range selection.
In this Pro version, users are able to choose from four different modulation sources including standard envelope filter sweeps, selectable LFO wave forms, a passive expression pedal and the Hot Hand motion sensing ring. An expression pedal input can be used to control filter modulation like in a standard wah pedal or a wide variety of parameters including sweep range, effect selection, LFO speed and more. As in our other Pro Series pedals, the BEF Pro features three footswitches to hold six customizable presets but also includes an option for Tap Tempo LFO on one of the footswitches.
"Good god what did you guys put in that thing! The Source Audio BEF is nasty good. I've had 9 filters before this one, full size old sheet metal Qtron & Micro version, Mutron III (reissue), Moog MF-101, Bassballs nano, Dr Q nano, EBS bassIQ & my current filters, full size Bassballs & Lovetone Meatball....you win!
The BEF to me is better sounding as a stand alone envelope filter than the Meatball, big statement...but the Meatball still wins for filtering other pedals, I like how organic it is. Although the BEF & Multiwave Bass distortion are made for each other, happy customer!"
- Mike Walle
"The versatility of my Source Audio Bass Envelope Filter has allowed it to take the place of several filters on my board. It has a wide array of tones that range from traditional to wild and formant-like, and they all retain a wet filter sound while avoiding volume spikes. The BEF also works fantastically with other pedals- it's an important element in creating a broad range of different synth sounds when combining it with octaver and fuzz pedals."
- Bryan Tyler
BASS ENVELOPE FILTER PRO INTERFACE
Sweep Range: Adjusts the direction and breadth of the filter sweep.
Frequency: Adjusts the center point of the filter sweep.
Preset Bank: Selects between preset banks A and B.
Effect: Selects the effect type.
EQ: 7-Band graphic equalizer saved per preset.
Speed: Adjusts the speed of the envelope filter attack and decay or selects Hot Hand axis.
Mix: Controls the output mix between clean and distorted signals.
Mod Source: Selects between envelope filter, LFO and Hot Hand modes.
Tap Tempo Eneble: Enables tap tempo for LFO mode.
Knob 1: Saves and recalls 6 programmable user presets.
Knob 2: Saves and recalls 6 programmable user presets.
Knob 3: Saves and recalls 6 programmable user presets.

I/O PORTS
Sensor In: For connecting an optional Hot Hand sensor, wired or wireless.
Guitar In: Guitar (or other instument) input.
Exp In: Allows morphing between presets.
MIDI In: Allows external access to presets and paramters.
Guitar Out: Output to amplifier or other effects.
Sensor Out: For daisy-chaining multiple Hot Hand-enabled pedals together.
9V DC: Accepts a 9V DC power supply.
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