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Synth (Subtractive) by Audioblast
AcidBox AcidBox AcidBox
What is it?
Operating System Availability
Operating System Latest Version
System Requirements
Windows 7 minimum.
System Requirements
Mac OS X 10.12 minimum.
Audio Demos
License & Installation Method
Instant (Serial Number)
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The AcidBox is a Bass Line Synthesizer recreation of the iconic TB-303 synth with a new interface and focused on real-time creation of sequences and tweaking in live situations.


  • classic "303" Saw / Square oscillators + a screaming LP filter.
  • easy to use sequencer with:
    • up to 32 patterns / 1 to 64 steps per pattern.
    • note / accent / slide for each step.
    • fine tune, micro time, pan for each step.
    • global gate parameter.
    • groove parameter.
    • copy/paste/randomize patterns.
  • 4 modes:
    • Host sync : AcidBox sequencer is full sync'ed to the host.
    • Internal : AcidBox sequencer is running independantly.
    • MIDI In : AcidBox reacts like any VA synth (overlapped notes = slide).
    • ARP mode : use the MIDI in messages to play the sequence.
  • use MIDI notes or parameters to trigger patterns.
  • pattern trigger can be synchronized to host (Beat, Bar, or free sync).
  • insert note in sequencer with MIDI in real time (use pitch bend up/down for slide).
  • built-in distorsion with 5 different units.
  • 1 ping pong delay with feedback filter.
  • export or import your sequences, patterns and banks in multi formats.
  • MIDI Out : the AcidBox can send the sequencer notes to the host.
  • 4 UI Sizes + dark mode.
  • Customizable random.
User Reviews Average user rating of 5.00 from 1 review Add A Review

Reviewed By Fruitynator [all]
July 5th, 2023
Version reviewed: 1.3 on Windows

Finally a 303 emulation that does everything right! The sound is great, nice presets, a sequencer that is fun to program, nice distortion modes built in, ... AcidBox is very well thought out. I have no criticism and can highly recommend it.

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