The Akai Deep Impact SB1 is a cult-classic, analog-style bass synthesizer pedal from the late 1990s that transforms electric bass signals into fat, synth-like tones using pitch tracking and filter modulation. Known for its massive analog character, tight tracking, and signature subby growl, it’s one of the most sought-after bass pedals ever made—especially since it was discontinued after a short production run.

The Akai Deep Impact SB1 is one of the most iconic bass synth pedals of all time. Whether you’re a tone hunter, collector, or live bassist seeking instant synth authority, this pedal brings true character and deep sonic manipulation. If you can find one in mint condition, it’s a powerful musical and investment-grade piece of gear.

What It Is

• Synth engine: Digital oscillator + analog-style filter section

• Tracking: Monophonic pitch tracking from your bass input

• Control: 9 preset patches (selectable with a rotary encoder), each with parameters for:

  • Filter cutoff

  • Envelope

  • Wave shape

  • Mix (dry/synth)

  • Decay

  • Volume

  • Sensitivity

• Expression pedal input for real-time control over filter sweep or other parameters

Why It’s So Desirable

• Unique analog/digital hybrid tone – thick, squelchy, and punchy

• Tracks incredibly well for a 1990s unit—better than many newer analog pedals

• Preset-based – plug and play with 9 immediately usable sounds

• Used by legends like Muse’s Chris Wolstenholme, whose massive synth bass tones helped make the pedal iconic

Pros

• Huge tone – from sub-bass to ripping filter sweeps

• Performs like a real synth – no need for a MIDI bass or external synths

• MIDI recall support – rare in stompboxes of its era

• Instant character – each preset is usable and musically distinct

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