Roland TB-03 Module with K-25m Keyboard

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  • Realistic Recreation of the Iconic TB-303 Bass Line Synth
  • 25 Velocity-Sensitive Keys
  • 24 Bit/96 KHz Stereo IN/OUT USB Audio Interface
  • Retains Sound, Character, and Interface of the Original TB-303
  • Highly Portable for Mobile Music Making

Roland TB-03 Module with K-25m Keyboard

The Roland Boutique TB-03 Module with K-25m Keyboard is a special bundle that features both the TR-03 Module and the accompanying K-25M keyboard, allowing you to play the module as a stand-alone unit. This bundle allows you to play directly from the TR-03 without requiring an external MIDI device. The Roland Boutique TB-03 Bass Line is a development of the famous TB-303 Bass Line Synth. With the same layout and controls, the TB-03 works just like the original. Upgrades include the all-new LED display to provide an enhanced programming experience and a wealth of new rotary controls to provide further access to essential controls.

Product Ref: 79654

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Full Description

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Roland Boutique TB-03 Bass Line Module

Development of a Classic

The Roland Boutique TB-03 Bass Line, inspired by the iconic TB-303 Bass Line Synth, uses Roland's advanced Analog Circuit Behavior to replicate the authentic sound and character of the original TB-303. The TB-03 provides efficient control options including a four-digit LED display for enhanced programming and rotary dials to give hands-on control over tuning, cutoff, resonance, envelop mod, decay, and accent. The original TB-303 featured pitch and time write modes, however the TB-03 goes a step further and interprets a new step-mode and fine tempo control to give you more convenient access to the controls that you need most.

Increased Versatility

The Roland Boutique TB-03 Vocoder also functions as a high-quality 24-bit/96 kHz audio interface to provide a simple and effective way of recording straight to your DAW. With a choice of USB or battery power, the TB-03 functions just as well on the road as in the studio. 4 x AA batteries provide the TB-03 with sufficient power, or alternatively you can connect to a USB power source to utilise USB bus power.

External Instrument Connection

The TB-03 Vocoder includes MIDI IN/OUT ports along with USB, to allow control information to be sent between external instruments and devices. With the ability to use the CV/Gate output for connection and control of analogue gear and modular synths, the TB-03 makes an extremely versatile synth/ recording device. The level of control is also reversible, with the external gear having the ability to drive the TB-03s internal sequencer. The USB ports also features MIDI data connection between any PC or Mac when connected.

Roland K-25m Keyboard for Roland Boutique Series

The Roland K-25m Keyboard is an expansion module compatible with all Roland Boutique series synthesizers which allows you to dock and connect the 25 key velocity sensitive keyboard. Measuring less than 12 inches wide the K-25m is extremely compact and incorporates an adjustable stand with 3 positions for optimized viewing and performance. The compact keyboard can also address a range from -4 to +5 octaves when used with the relevant module.


Roland Boutique TB-03 Bass Line Module


  • 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 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


Roland Boutique TR-03 Rhythm Module

User Memory
  • Patterns: 96 (4 groups (I, II, III, IV) x 3 sections (A, B, C) x 8 patterns)
  • Tracks: 7
  • 2 (SAW, SQUARE)
  • VOLUME knob
  • TUNING knob
  • CUT OFF FREQ knob
  • RESONANCE knob
  • ENV MOD knob
  • DECAY knob
  • ACCENT knob
  • OVERDRIVE knob
  • DELAY TIME knob
  • WAVE FORM switch
  • TRACK PATT. GROUP selector
  • MODE selector
  • TEMPO button
  • VALUE knob
  • PATTERN CLEAR button
  • RUN/STOP button
  • PITCH MODE button
  • FUNCTION button
  • Keyboard buttons (C, C#, D, D#, E, F, F#, G, G#, A, A#, B, C)
  • TIME MODE button
  • ACCENT button
  • SLIDE button
  • BACK button
  • TAP button
  • OVERDRIVE (Overdrive/Distortion)
  • DELAY (Tape Echo/Digital Delay/Reverb)
  • 7 segments, 4 characters (LED)
  • TRIGGER IN jack: Mono miniature phone type
  • CV OUTPUT jack: Mono miniature phone type
  • GATE OUTPUT jack: Mono miniature phone type
  • PHONES jack: Stereo miniature phone type
  • OUTPUT jack: Stereo miniature phone type
  • MIX IN jack: Stereo miniature phone type
  • MIDI: IN, OUT connectors
  • USB port: Micro-B type (Audio, MIDI)
Power Supply
  • Rechargeable Ni-MH battery (AA, HR6) x 4
  • Alkaline battery (AA, LR6) x 4
  • USB bus power
Current Draw
  • 500 mA (USB bus power)
Expected battery life under continuous use
  • Rechargeable Ni-MH battery: Approx. 5 hours
  • * This can vary depending on the specifications of the batteries, capacity of the batteries, and the conditions of use.
  • 308 (W) x 130 (D) x 52 (H) mm
  • 12-1/8 (W) x 5-1/8 (D) x 2-1/16 (H) inches
  • Weight (including batteries, excluding Boutique Dock)
  • 940 g
  • 2 lbs 2 oz
  • Boutique Dock: DK-01 (Silver)
  • Owner's Manual
  • DK-01 Owner's Manual
  • Alkaline battery (AA, LR6) x 4

Roland K-25m Keyboard

  • Keys: 25
  • Key Action: Velocity Sensitivity
  • Stand Orientation: Three Position
  • For Rolland Series: Boutique
  • Finish: Black