MIDI PhraseBook

MIDI PhraseBook is an algorithmic composition tool for Windows. Generate and play musical phrases based on the parameters you choose, such as key, tempo and duration. Once generated, MIDI files can be saved for use in other apps such as DAWs.

Global composition parameters include key signature, time signature, tempo in BPM, and number of measures. It supports two instruments, either two channels on a MIDI device or two MIDI devices. Each instrument has its own unique settings for octaves, velocity, note density and more.

Manually select the options you want, or select the randomize option and see what ensues. Three levels of randomization are provided, to produce results ranging from tame to ... interesting. A free trial version limits some functionality and should be useful in determining whether the application supports your interests and your environment. Both versions let you export or drag MIDI data to other apps so you can be certain PhraseBook is compatible with your favorite programs.