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I bet you didn’t know marbles could play music. Well, at least melodies without a marble machine. The melody is programmed into …
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Gravitrax should make a xylophone extension with a a straight through tile having a depression for individual xylophone pieces that marbles roll over.
And, for more complex stuff, there can be a multi launch pad launching a couple of marbles parrelel to eachother with one press without power dome starters.
mmm… yes….. music..