To change tube, press space. Music is supposed to change regularly, so if it does that it's not a glitch, just the programming. If you don't like it, comment about it and I'll make each sound play for longer. Remember, I said COMMENT about it, not COMPLAIN about it.
I used the core coding Cassandra-princess made, since I can't code things like that, I'm not very good at this. Also, if you change tubes quickly it looks like your crushing the scuba diver between the astro-puppies.