BOSS, a subsidiary of Roland, is primarily known for its guitar effects pedals but has made notable contributions to the synthesizer world, especially in the realm of guitar synthesizers. One of its early ventures into rhythm and sound creation was through the **DR Series (Dr. Rhythm)** drum machines, like the DR-55 and DR-110. These machines gained popularity for their simple programmability and reliable construction, making them favourites among musicians needing custom rhythms without a full band setup. While not traditional synthesizers, the DR series helped establish BOSS as a key player in electronic music gear.

In the world of guitar synthesizers, BOSS introduced the **SY Series**, which brought synthesis capabilities directly to guitarists. The **SY-300** is a standout model, allowing guitarists to access a wide range of polyphonic synth sounds without needing a special pickup. Similarly, the **SY-1** offers 121 sounds in a compact, pedal-sized format, providing quick and intuitive access to leads, pads, basses, and more. These models have been praised for their ease of use, robust build, and seamless integration into traditional guitar rigs, expanding the creative possibilities for guitarists without requiring extensive technical knowledge.