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Roland TB-03 Bass Line


(4 reviews)

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Introducing the Roland TB-03 bass Line: The Classic TB-303 Sound Now in the Palm of Your Hand!

The battery-powered TB-03 is a direct descendant of the famous TB-303 Bass Line Synth. The layout and controls are unchanged, so it works just like the original. It sounds like it too, thanks to Roland’s advanced ACB technology that recreates the hypnotic liquid grooves of the magic silver box. But the new TB-03 goes even further, with several enhancements not found on the original model...

The four-digit LED display makes programming easier and more accurate, while overdrive and delay effects let you unleash a twisted, tribal wall of sound to send the crowd into a frenzy. Back in the studio, the TB-03 can send control information via MIDI or its USB port, the latter of which also functions as a 24-bit/96 kHz audio interface.  

Authentic 303 Sund and Behavior via Roland’s ACB Technology
You know when you hear a TB-303—a hypnotic, tribal sound that works best in dark, crowded rooms with big sound systems. Using the same ACB (Analog Circuit Behavior) technology from the acclaimed AIRA series, the TB-03 accurately emulates the expressive, slippery sound of its older brother, and even adds a few surprises. Saw and square waveforms are available, along with all of the rotary control knobs that help shape the 303’s unique character, including tuning, cutoff, resonance, envelop mod, decay, and accent.

New Features Not Found in the Original
The TB-03 includes several enhancements over the original TB-303. Firstly, the four-digit LED display makes programming easier and more detailed, since you now have a visual representation of the value being edited. Then there are a variety of overdrive, delay, and reverb effects that dramatically change the mood and tone of the TB-03, going from smooth to spiky to squealing. Programming patterns is also easier thanks to newly added functions that include step write, shuffle, and fine tempo control. Finally, the inclusion of MIDI and USB ports mean that the TB-03 can send and receive control information and connect easily to computer-based DAWs.

Classic TB Sequencer with Enhanced Functions
If you’re familiar with the TB-303’s programming method, then you’ll feel right at home with the TB-03. The original Pitch and Time write modes are included, along with an all-new Step mode. Pattern programming is also enhanced by the LED display, which shows the current step in the sequence as well as showing fine tempo values (such as 125.5 BPM). The internal sequencer can be triggered externally via the trigger input, and you can even switch between write and play modes without stopping pattern playback, opening up new possibilities for live performance.

Connect with External gear
The TB-03 includes MIDI IN/OUT ports and USB, allowing control information to be exchanged with other instruments and devices. This turns the TB-03 into a versatile controller, especially as you can use the CV/Gate output to control external analog gear and modular synthesizers. This level of control works both ways, thanks to the trigger input that lets external gear drive the TB-03’s internal sequencer. Once connected to a PC or Mac, both audio and MIDI data can be sent through the USB port.

Battery or USB Bus Power
Some of the best music is made away from the studio, so the Roland Boutique series runs on 4 x AA batteries, ready for when inspiration strikes. Alternatively, the TB-03 can run on USB bus power.

USB Audio Interface for Direct Recording to Your DAW
Via its USB port, the TB-03 functions as a high-quality 24-bit/96 kHz audio interface, providing a simple and reliable way of recording directly to your DAW application. You can keep your favorite settings and sequencer patterns safe too via the USB data backup function.

• Realistic recreation of the iconic TB-303 Bass Line synth
• Retains the sound, character, and user interface of the original TB-303
• Hands-on control over expressive parameters, including cutoff, resonance, envelope mod, decay, and accent
• New features not found on the original TB-303, including four-digit LED display, overdrive and delay effects, MIDI, fine tempo control, and additional functions for pattern creation
• Programmable via classic Pitch, Time, and Step write modes
• Continue playing a sequence even while switching between write and play modes
• CV/Gate outputs for controlling vintage analog gear and modular synthesizers
• Dedicated trigger input to drive the internal sequencer
• Highly portable for mobile music making
• High-quality construction with metal front panel
• Battery-operated (4 x AA) or USB powered
• 24 bit/96 kHz stereo IN/OUT USB audio interface
• Control information can be sent and received via MIDI and USB
• Built-in powered mini-speaker for instant enjoyment
• Compatible with optional K-25m Keyboard Unit

Get your Roland TB-03 Bass Line today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.

Updated and Enhanced!


This hand-held, battery-powered version of the beloved TB-03 is a major home-run from Roland! The new TB-03 has all the features, and familiar layout of the TB-303 with extras added in. In addition to all the beloved tones featured on the predecessor, the TB-03 has a new four digit LED display which makes programming far easier and more accurate than ever before, no more guess-work! There are a ton of delay, overdrive and reverb effects that can drastically change the tone that are included on this updated version. The TB-03 also allows the user to connect directly to your computer via USB and MIDI ports.

Lady Landa

Edison, NJ

Classic Gets An Upgrade


The Roland TB-03 Bassline is the same bass line synth you know & love with a few upgrades. New features not found on the original TB-303, including four-digit LED display, overdrive and delay effects, MIDI, fine tempo control, and additional functions for pattern creation. It's battery or USB powered, has Analog Circuit Behavior & has a built in speaker.

Christopher H

Cincinnati, OH

Bringing back a classic


This year Roland brought back a fan favorite, the TB-303. Renamed the TB-03, this synth has the same layout as the vintage 303 but has a few enhancements like MIDI in and out as well as USB so you can record right into a DAW system. Great sound and very fun to play with.


Edison, NJ



Roland has been re-releasing quite a few of their older formats and I am glad to see these coming back with updated stuff on them! The TB03 is much like its older brother but has both MIDI and USB capabilities, effects and led lights. They sound as great as the original and I have had fun playing around with these. You can buy the optional $99 keyboard for them or MIDI them up to your own or control them through the computer. Very versatile and fun!!

Lee @ Sam Ash Cincinnati


TB-03 Bass Line

5.0 4


Battery Type 4 x AA
Power Battery or USB Bus Power
Display Four-digit LED display
Other Features Built-in powered mini-speaker for instant enjoyment
Audio Resolution 24-bit/96kHz
CV Jacks (Control Voltage) Yes
USB MIDI Connector Yes
More Info
Warranty Info:

The manufacturer's warranty covers parts for one year and labor for 90 days from date of purchase. The warranty excludes damage from misuse, abuse, and contains other exclusions.

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