Based on its enormously successful predecessor, the Soundblox Bass Envelope Filter, comes the Source Audio Soundblox Pro Bass Envelope Filter, an updated, upgraded filter effect pedal. With 22 distinct envelope filtering effects like Single Peak, Triple Peak, 2-Pole Low Pass, and even some phasing effects, the Soundblox Pro Bass Envelope Filter is hugely versatile -- not to mention its Frequency, Sweep Range, Speed, and Mix parameters for extra tweakability. Choose between four different modulation sources, like standard filter sweeps and LFO wave forms, to give you even more variability in the sounds you can wring from the Pro Bass Envelope Filter.