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SoundHelix is a free versatile Java framework for algorithmic random music composition. SoundHelix can generate random songs, play them (for example, on any number of MIDI devices or MIDI-capable software synthesizers) and is highly customizable using XML configuration.

SoundHelix produces music that is actually enjoyable to listen to.

Features:

produces enjoyable non-esoteric algorithmic random music
can generate full songs within a couple of milliseconds
fully configurable using XML
can be used
as a standalone Java application
as a JNLP-based applet
as a webpage-based applet
within third-party Java software (e.g., as in-game music) via the SoundHelix API
includes an integrated custom MIDI player, which
can remote-control any number of MIDI devices in parallel with up to 16 MIDI channels each
supports any number of synchronized LFOs for slowly changing MIDI parameters (modulation wheel, pitch bend, etc.)
supports sending MIDI timing ticks to selected MIDI devices (for timed effects like echo)
supports configurable non-uniform timing (groove patterns)
supports milli-BPM playing speed resolution
allows saving generated songs in MIDI (.mid) format
can be extended easily by providing additional implementations for the defined interfaces