The sound from the theremin (or voltage output if available) is recorded live and captured by the software. The software then splits out the frequency and amplitude values and maps these to a virtual joystick, which has different 'hit areas' corresponding to the different buttons on a controller. The button presses are then fed into the game running on the same computer.The work-in-progress video posted on January 22, 2009 shows a bit more of the rough set-up.
For single player mode, a software 'bot' reads the screen and detects which chords are coming up. When the player strums a note which is part of a chord, the bot automatically adds in the rest of the note button presses to make up the full chord.
In co-op mode, player 1 combines the second note of the chord is played by player 2. In this mode, player 2 strums chords only, and player 1 strums single notes only.
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