Whilst this app does sound like it might be an interesting and even useful thing to have around, $19.99 for an app with only this as it’s description (see below) seems a little expensive to me. However, you should as always, make up your own mind.

XII is an “auto-composition” app that generates music with Twelve-tone technique.

This is the piano version.

  • real-time calculation
  • sequence setup.
  • background audio.
  • wifi-midi send.

Doesn’t seem like a lot to go on for $19.99, in my opinion.

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