Our extremely accurately modeled 303 bassline emulator with built-in sequencer -- a true studio classic!

The most advanced software 303

The legendary silver box which is hallmark in electronic music has been recreated in AudioRealism Bass Line 2 (ABL2). Analog modeling techniques have been employed to create a DSP-algorithm that accurately emulates every aspect of the original TB-303, from growling basses to hollow middles and beeping highs with metal rattling accents. Patterns are composed in a fashion similar to the original using the integrated step sequencer with easy to use manipulation functions such as transpose and randomization.
The Audio Analyzer allows taking a sampled 303 pattern (or other audio) and automatically transcribe to ABL2 format
Preferences allow adjustment of resonance boost, filter pre-gain amount and more.


The pattern analyzer is a tool for editing and analyzing patterns. In further aid to help users transition their original patterns into ABL an audio detection algorithm has been devised. That's right - it can create patterns using audio files as a source. How does it work? The original patterns are recorded under certain conditions, then simply hit Detect from wave and select the audio file. ABL2 will create a pattern resembling the audio input. Listen to the audio detection examples above for an demonstration.

sound comparisons between a 303 and abl2

configure your abl2

The configuration screen allows you to customize your ABL2 to your liking, we even go as far as allowing you to tweak some of the internals such the Filter Vcc feed voltage, pre-gain and basic frequency offset. There is also options for selecting VCA clicks and whether to auto level the volume (which operates like a compressor but without any lag). ABL2 also allows visual configuration by use of skins.

additional resources

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File Size: 345 kb
File Type: wav
Download File

File Size: 229 kb
File Type: wav
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File Size: 239 kb
File Type: wav
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  • Extremely accurate TB-303 emulation
  • Internal step sequencer with per pattern shuffle
  • Full MIDI CC control with learning function
  • Integrated distortion unit
  • High pass filter (low cut)
  • Rebirth pattern import 
  • Two MIDI modes (Pattern or Note)
  • Sample accurate sync to VST and AU hosts
  • Shuffle (4/4 and triplet modes)
  • MIDI Pattern Export
  • MIDI Output (certain hosts only)
  • Assign front panel functions to MIDI keys

COMments and reviews

Kai Tracid: "The ABL is a real joy, the interface and sound is just like the Real thing! I've been using it extensively and it is totally stable" "Five plus for the authentic digital emulation"

Remix Magazine: "After closely comparing ABL2 with a genuine TB-303, it's clear that AudioRealism's virtual clone is a dead ringer for the real deal". Read the full review here

Dancetech"[We] give the ABL a totally resounding 10/10!!" (Visit for full review) 8/10 User rating (visit for the full comparison)
Disclaimer: The TB-303 was originally produced by Roland®. Roland® is a registered trademark of Roland Corporation and/or Roland Corporation U.S. The reference to Roland® is made here strictly for the legitimate purpose of comparison, and it does not in any way imply Roland®’s permission or endorsement of this product.