The Roland TB-303 Bass Line was introduced in 1981 as a compact programmable bass synthesiser intended to provide an electronic alternative to an electric bass player. Designed by Roland engineer Tadao Kikumoto, the Roland TB-303 Bass Line was conceived alongside the Roland TR-606 Drumatix, with the two machines able to synchronise through Roland’s DIN Sync system. The combination was intended to give solo musicians a portable programmable rhythm and bass accompaniment system for practice and performance.
At the centre of the Roland TB-303 Bass Line is a monophonic analogue synthesiser with switchable sawtooth and square waveforms. The oscillator feeds a resonant 18 dB-per-octave low-pass ladder filter, with front-panel controls for Cutoff Frequency, Resonance, Envelope Modulation, Decay and Accent. A separate Tuning control adjusts oscillator pitch, while the Accent system interacts with programmed notes to create variations in emphasis within a sequence.
Unlike a conventional keyboard synthesiser, the Roland TB-303 Bass Line was designed around its integrated step sequencer. Notes and their timing information could be entered into memory to build repeating bass patterns, with Accent and Slide information stored as part of each pattern. Slide allowed consecutive notes to be connected by a continuous pitch transition, while Accent provided additional emphasis to selected steps. These elements would later become fundamental to the performance techniques developed around the Roland TB-303 Bass Line.
The sequencer provides 64 pattern memories, organised as eight patterns across two pattern sections and four pattern groups. Stored information includes pitch, note length, Accent and Slide. Patterns can span a three-octave range, while track programming extends the available range to four octaves through key shifting. Patterns can also be chained together within the track system to create complete bass arrangements rather than simple repeating phrases.
Seven track memories are provided, with up to 64 measures available for an individual track and a maximum stored capacity of 256 measures. Track data can contain the order in which patterns are played, pattern transposition and repeat instructions. The Roland TB-303 Bass Line therefore operated as both a synthesiser and a self-contained programmable performance sequencer, rather than simply generating a single manually played bass sound.
The Tempo control covers a quarter-note tempo range from 40 to 300, while dedicated Pattern Write, Pattern Play, Track Write and Track Play modes divide the programming and playback functions. Pitch and timing entry are handled separately, a programming method that was unusual compared with conventional keyboard performance and contributed to the distinctive way sequences were constructed on the Roland TB-303 Bass Line.
Connection facilities include a main audio output, headphone output, CV output, Gate output, Sync input and Mix input. The CV output operates from +1V to +5V using a 1V-per-octave relationship, while the Gate output switches between 0V and +12V. These connections allowed the Roland TB-303 Bass Line to control compatible analogue equipment as well as synchronise with other Roland sequencers and rhythm machines. The Mix input operates at unity gain and allows an external signal to be passed through the unit.
The Roland TB-303 Bass Line can operate from four 1.5V batteries or a 9V AC adaptor. Its compact 300mm-wide enclosure and 1kg weight reflected Roland’s original intention that the system should be easily portable. Roland supplied the Roland TB-303 Bass Line with an SC-303 compact soft case and PJ-1 connection cord.
Commercially, the original purpose of the Roland TB-303 Bass Line was not a major success. Roland later stated that approximately 10,000 units were produced before the instrument was discontinued after a relatively short production period. Its inability to convincingly reproduce an electric bass guitar meant that the Roland TB-303 Bass Line did not achieve the role for which it had originally been designed.
The historical importance of the Roland TB-303 Bass Line emerged several years later. In Chicago, Earl “Spanky” Smith Jr. obtained a second-hand Roland TB-303 Bass Line, which became part of the equipment used by Phuture. During experimentation with the machine, DJ Pierre manipulated the Cutoff Frequency and Resonance controls while a programmed pattern was running. This approach produced the continuously changing resonant bass sequences that became central to Phuture’s “Acid Tracks”, originally known as “In Your Mind”.
A pre-release version of “Acid Tracks” was played by Chicago DJ Ron Hardy in 1985, while the finished recording was subsequently released by Trax Records in 1987. The Roland TB-303 Bass Line became inseparably associated with the emerging acid house style, with musicians exploiting the interaction between its sequencer, Slide, Accent, filter cutoff and resonance in ways that were very different from its original intended use.
The rediscovery of the Roland TB-303 Bass Line transformed an unsuccessful electronic bass accompaniment machine into one of the defining instruments of electronic dance music. Its influence spread from Chicago house into acid house and subsequently across numerous forms of electronic music. The distinctive sequencing behaviour and analogue circuitry of the Roland TB-303 Bass Line also led to numerous later hardware and software instruments designed to reproduce or extend its architecture.
Features
- Monophonic analogue bass synthesiser with integrated step sequencer
- Switchable sawtooth and square oscillator waveforms
- 18 dB-per-octave resonant low-pass ladder filter
- Cutoff Frequency, Resonance, Envelope Modulation, Decay and Accent controls
- Programmable Accent and Slide for individual sequence steps
- 64 pattern memories organised into four pattern groups
- Seven-track arrangement sequencer with pattern chaining and transposition
- Three-octave pattern range and four-octave track range
- CV and Gate outputs for controlling compatible analogue equipment
- DIN Sync input for synchronisation with compatible Roland equipment