Bonus Puzzle #2: Synthesizer

Today's update adds a new weekly bonus puzzle, the SYNTHESIZER!

"The battery-powered Matsuzawa Grendel let keyboard players jam with the music anywhere, anytime. It was praised for its eight realistic built-in voices and four-note polyphony, but some criticized the small number of keys."

This update also includes a small improvement to the output comparison tool where remnants will now be highlighted when the output product has otherwise been completed.