Audition a key, choose a scale, pick from chords that fit, then explore voicings and inversions until it feels right. Connect to anything: Pair with any DAW, synth, or groovebox over Bluetooth or USB. KeyLens connects as a standard MIDI controller — no extra plugins, no fuss. MIDI controller: Trigger combined chords and keys locked to your scale, Use the split MIDI channels to drive multiple instruments at once. Learn it on piano: An easy-to-read chart view shows you exactly which chords you're playing, so you can perform every progression on piano with confidence. Save chord your progressions and instantly pick up where you left off.