I just found out that checking the Effect 4 flag on Zoom Tubes makes the player spin back and forth in it endlessly. That means that you spin from the first to the last waypoint, then back to the first, then to the last again, and so forth. Apparently, there's no way to stop this effect or escape otherwise, so you're trapped forever. My questions to the devs or anybody else who figures this out: Is there any use for this? Is there a way to make the player escape? Is this just a broken or unfinished feature? Who knows something?