Scaler 2 is an inspirational and powerful music theory workstation that gives you access to a world of new ideas, expressions and melodies. With powerful detection of MIDI and audio, Scaler 2 can determine what key and scale you’re in and suggest chords that match your music. The plugin helps you discover the perfect melody with performance expressions, and can even suggest ways to change from one key to another.
![Quartet 1 v2.0.1 iPhone & iPad [iOS]](http://www.bixinyinyuan.com/wp-content/uploads/2025/04/11_副本-3.webp)
