I'm on linux, and it worked so and so. no errors, but I can't play it
anywhere.

It's my humble opinion that "not being able to play it" counts as a error when we are talking about .wav files...

On Win XPsp1, EMU1616m, latest ChucK, (ASIO-build) I was able too start the VM with
chuck otf_03.ck

then from another window run;
chuck + rec-auto.ck

let it go for a few seconds.

Quit the VM with Ctrl+c.

The resulting file played fine in Winamp. I do think the ASIO build may have some different flags that could affect wave in/out. I don't have the regular version installed on my XP laptop right now because the regular drivers have so much latency.

Cheers,
Kas.