Boss DR-3

Dr. Rhythm Practice & Jam Along Drum Machine

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A Fast and Easy Solution for Professional-Sounding Drums

With the DR-3 Dr. Rhythm, guitarists and songwriters can add incredible-sounding drums to their music. This ultra-affordable drum machine includes some of BOSS' best acoustic and electronic drum kits and a selection of bass sounds. Great for jamming, the DR-3's Rhythm Progressions and multiple variations make it easy to create a realistic-sounding drum track for any style of music. And with Total Sound Control, you can tweak your kits to perfection.

Boss By Roland Authorized Reseller

General Features:

  • BOSS' most affordable drum machine for jamming or practice
  • Realistic drum, percussion and bass sounds with velocity-sensitive pads
  • New Rhythm Progressions with 3 variations each for Intro, Verse, Fill and Ending
  • New TSC with Sound Shape function and Ambience for professional drum sounds
  • 100 Preset Styles and 100 User styles programmable via realtime or step recording
  • Footswitch input for easy live control; runs on AC or battery power
  • Optional DVD Manual: Boss DR-3DVM
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty


  • Styles: User Style: 100, Preset Style: 100
  • Songs: User: 100, Song Length: Max. 250 patterns for a song
  • TSC (Total Sound Control): Preset Patch: 8, User Patch: 8 Preset Patch: 8, User Patch: 8
  • Max. Polyphony: 12 voices
  • Instrument: Drum and perc: 120, Bass: 12
  • Resolution: 96 per quater note
  • Tempo: 20 to 260 bpm
  • Recording Method: Realtime/Step
  • Pads: 13 (Velocity-sensitive)
  • Display: Backlit LCD (16 characters x 2 lines)
  • Connectors:
    • Output Jack: L, R (RCA Phono type)
    • L(PHONES), R(MONO) (1/4-inch phone type)
    • Foot Switch Jack (Stereo 1/4-inch phone type)
    • MIDI IN Connector
    • DC IN (AC Adaptor Jack)
  • Power Supply: DC9V: Dry Battery (AA) x 6, AC Adaptor (PSA-series)
  • Power Consumption: 200 mA
  • Accessories: Dry Battery (Alkaline LR6 (AA) type) x 6, Owner's Manual, Roland Service Information Sheet
  • Options: AC Adaptor: PSA Series, Foot Switch: FS-5U, Foot Switch Cable: Roland PCS-31
  • Dimensions: 8-7/16"W x 7-5/16"D x 2-1/8"H

General Features

Display Type
The type of display on your receiver refers to the monitor that is used to display the source information such as song names, radio stations, or track times.

Dot-Matrix Text Display: A simple display which uses dots in specific illuminated color(s) to light up and form letters or numbers that are displayed on the receiver.

Graphic or Motion Display: Typically found in mid to high-end receivers and give your text information and receiver more life by adding motion, backgrounds, or multiple colors to your display. There are types of graphic displays such as 3D Graphic, Motion, and OEL (Organic Electroluminescent) displays. They can range from one color to full color displays and typically allow you to select from one of many built-in animations, background images, screensavers or other graphics to enhance your experience and add an extra bit of personality to your system. Some units also come with software that allow you to load your own customizable pictures or animations.

LCD Monitor Display: Can be as small as 2" or as large as 10". Some LCD displays are motorized for angle adjustment. LCD monitors display full motion video playback as well as your standard text such as track status, radio station information and more depending on the receiver's features.

Pads/Triggers are the amount of drum pads on the drum machine.
Sample Rate
Sample rate defines the number of samples per second (or per other unit) taken from a continuous signal to make a discrete signal.
Polyphony is a texture consisting of two or more independent melodic voices.
Timing Resolution
Select the effects which are stored and recalled with every Drum Set.
Preset Sounds
Preset Sounds is the number of integrated sounds the drum machine will produce.
Preset Notes
Select the amount of Preset Notes that are integrated into the drum machine.
Preset Patterns
The user creates drum patterns by pressing the trigger pads as though a drum kit were being played. The pattern is built up over time by adding individual sounds.
Preset Songs
Select the number of Preset Songs integrated on the Drum Machine.
Preset Kits
A Sequencer is software or hardware device for recording, playing, and editing digital music data.
Expansion Slots
Expansion Slots are ports which other devices can be connected to to expand drum capabilities.
Sample RAM
Sample RAM is the UltraSound offered MIDI playback by loading instrument patches into adapter RAM.


MIDI Inputs
This is the number of MIDI inputs that connect to the Drum Machine. MIDI (Musical Instrument Digital Interface) allows electronic musical instruments such as keyboard controllers, computers, and other electronic equipment to communicate, control, and synchronize with each other.
Power Inputs
Select the number of Power Inputs equipped on the Drum Machine
1/4" Stereo Inputs
Select the number of Stereo Inputs.


MIDI Outputs
This is the number of MIDI outputs that connect to the Drum Machine. MIDI (Musical Instrument Digital Interface) allows electronic musical instruments such as keyboard controllers, computers, and other electronic equipment to communicate, control, and synchronize with each other.
Headphone Outputs
Select number of outputs for headphone connection.
Main Left Outputs
Select number of Main Left outputs.
Main Right Outputs
Select number of Main Right Outputs.
1/4" Stereo Outputs
Select the number of Stereo Outputs available on this Drum Machine.


The width of the item from left to right (side-to-side) measured in inches.
The height of the item, measured from top to bottom, in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
Weight (Pounds)
This is the weight of the item in pounds (lbs).
Primary Color
This is the main color of the item.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
90 days
Warranty Provider

Summary of Customer Ratings & Reviews

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Boss DR-3

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Boss DR-3

Dr. Rhythm Practice & Jam Along Drum Machine


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