Source Audio Soundblox
Bass Envelope Filter
Twenty Two Filter Effects For Guitar
Free USA Shipping!
Peace Of Mind - Authorized Source Audio Dealer!

Source Audio Soundblox SA143 Pro Bass Envelope Filter
Source Audio Soundblox SA143 Pro Bass Envelope Filter
Item# SA143
Suggested Retail: $299.00
Our Low Price: $229.00

Soundblox Pro Bass Envelope Filter


About This Item: 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.

Free USA Shipping!: Simply add this pedal to your cart. No Coupons, No Codes to enter. (Note: Not all items ship free. If you purchase additional items, shipping fees may be charged for those items.)

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.


Bass Envelope Filter Pro Interface

Roll your mouse over the panel controls to learn about each one.

Adobe Flash plugin 9 or above is required to view this content. Please download the plugin from Adobe.


I/O Ports

Roll your mouse over the panel controls to learn about each one.

Adobe Flash plugin 9 or above is required to view this content. Please download the plugin from Adobe.


Soundblox Pro Bass Envelope Filter Features & Specifications

  • 22 Filter Sounds including 2 Pole Low Pass, 4 Pole Low Pass, Single Peak, Triple Peak, Peak & Notch, and Phasers.
  • Positive and Negative filter sweep with variable range and sensitivity.
  • Wet/Dry Mix knob featuring our signature low-end preserving algorithm ‘Lo-Retain™’.
  • 4 modulation sources including envelope, LFO, expression pedal and Hot Hand.
  • Tap tempo speed control for LFO.
  • State-of-the-art DSP — Our proprietary 56-bit Digitial Signal Processor, the SA601, and crystal clear 24-bit converters.
  • 6 user presets — Easy to configure user presets in two banks selectable via 3 footswitches for quick access of your favorite sounds.
  • 7-Band Equalizer — Ultra precise 7-band equalizer for in-depth tone control saved per preset.
  • Extended Control — An expression input allows for control of a wide variety of pedal parameters. A MIDI input also allows external access to presets and parameters.
  • Motion Control — All Soundblox and Soundblox Pro pedals are ‘Hot Hand Ready®’ and can be used with any Hot Hand motion sensor to extend the capabilities of the unit.
  • Active Analog Bypass — Bypass is fully routed around the DSP and active input ensure zero signal degradation.
  • 9V DC power supply included.
  • Dimensions: 7 in./17.8 cm (length not including I/O jacks) x 6 in./15.25 cm (width) x 2 in./5 cm (height, including knobs).

Want To Know More?

We know that once you understand the capabilities of this amazing pedal you will want to get your hands on one. To convince you, here are some additional resources to wet your appetite.

Video - In-Depth Demonstrations

In this first video, Will Cady of Source Audio demonstrates a number of settings on the Soundblox Pro Bass Envelope pedal.


Are you trying to create that unique Dubdub sound? This next video from our friends at Source Audio shows how to do it with this pedal and a Wireless Hot Hand controller.

Documentation - Available As PDF Files

Pro Bass Envelope Filter Manual - Download PDF

BEF Pro Expression Pedal Control Supplement - Download PDF

Source Audio Product Brochure - Download PDF