Roland RS-101 is a versatile keyboard featuring 61 keys and a range of tones, including strings and brass. It has three tone variations: Strings I, Strings II (an octave higher than Strings I), and Brass. These tones can be combined or selected independently for both the bass and treble clefs. The RS-101 also includes controls for volume, attack, sustain, vibrato, and tuning, allowing for customization of the sound. Additional features like "Volume Soft" and "Slow Attack" tablets aid in balancing volumes and delaying attack time, enhancing the overall playing experience.