The following is a list of built-in effects in the RC-300.

REVERB

TRANSPOSE

MODULATION

• Flanger
• Phaser
• Pan
• Tremolo
• Slicer
• Bend
• Chorus

VOICE

• Robot—produces a robotic effect.
• Female—simulates a female voice from a male voice.
• Male—simulates a male voice from a female voice.

GUITAR

• GT-Bass—simulates a bass sound from guitar.

OTHER

• Filter
• Delay
• Lo-Fi
• Distortion—Natural OD, Blues OD, OD-1, Warm OD, Distortion, Modern DS, Stack, Loud, Metal Zone, 60's Fuzz