Scala (software)

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Scala is a freeware tool for Windows, macOS, and Linux that helps you create, archive, and work with microtonal musical scales and MIDI. It started as a command-line program but now has a GTK+ graphical interface. Written in Ada by Manuel Op de Coul, Scala lets you build scales, analyze and transform them with built-in tools, and play them on an on-screen keyboard or a MIDI keyboard. You can retune MIDI streams and files using pitch bend, and it supports MIDI SysEx and file-based tunings.

Scala can open, edit, and save standard MIDI files, and export tuning tables in .tun format. It includes a native sequencing language (.seq) and stores scales in human-readable text files, a format that has become widely used for microtonal music. More than 30 applications support the Scala format, including major tools like Apple Logic, Celemony Melodyne, and Cakewalk Rapture. The project also provides an archive with over 5,000 Scala scale files. The latest stable release was 2.3.8 in 2015.