Full-fledged, true analog synthesizer: VCO, VCF, LFO. Inspiring, easy-to-play ribbon keyboard. Intuitive, fun-to-tweak controls. Features the same classic analog filter found in the legendary Korg MS-10 & MS-20. Filter any external source using the audio input jack. LFO can modulate either pitch of filter cutoff. LFO Rate knob features cool LED visual indicator. Battery operation and palmtop size equals true portability. Internal speaker/headphone jack lets you enjoy the sound anywhere – alone or with friends! - See more at: http://www.korg.com/us/products/dj/monotron/