You play your chords with your left hand, the melody with your right, and nimbu does the accompaniment. Just like an auto accompaniment. Yet with more tones. nimbu comes with 100 styles and imports Yamaha styles. In addition nimbu calculates chord progressions and title-related accompaniments from MIDI Files.
It's a brand new thing so will have some growing pains, but I've been using mine daily for a few months and it really helps to capture those fleeting thoughts!
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