Metronome example doesn't work

[camio]

On my machine I get no sound and the following output when I used "adapt metronome" with ghci EventTut?.hs:

<interactive>: Future mempty: it'll never happen, buddy

This code (aside from the legacy adapter) is from David and Conal's Event tutorial here:

http://netsuperbrain.com/blog/posts/introducing-reactive-events/

Sasha Rush and Michael Smith both wrote their own Legacy Adapters using adaptE and gained similar results. I suspect this is somehow related to #2 since I discovered that bug by narrowing down a different program with similar behavior.

[camio]

Oh, I forgot to mention that on the blog page, those two contributors posted their code and mentioned the results they got.