ArpNebula plays the chord you hold note by note in the song's rhythm. Rate from 1/4 to 1/32 with triplets, directions Up, Down, Up/Down, Down/Up, Random, As Played and Chord, up to four octaves. While the DAW plays, the steps lock to the bar grid; when it's stopped, the arpeggio starts the moment you press a key. Set the step pattern (up to 16) with clicks: step off, normal or accented — a pattern shorter than 16 gives you polymeter. Swing, Gate, Accent and Random Skip turn a plain arpeggio into a groove, and Latch keeps the chord going after you let go. Notes go to the MIDI output for any synth, and the built-in sound (Pluck, Keys, Piano, Bells, Pad) plays right away. Drag four bars of the arpeggio from the current chord onto a track as .mid.