well, this is embarrassing.
both smplayer and winamp seem to be functioning just fine. it's a problem in foobar.
that really should have been a very early troubleshooting step. i guess when i realized that the clock was screwing with the asio output, my head get locked into something under the hood. and, it may be that there's two problems here, not one. but that's still something i should have ruled out early.
i'm going to get the whole thing set up properly and test again. if it works out, i'm left concluding that foobar is foobared.
my best guess is that i'm transferring something over from a past install and it's just a question of reinstalling the program.
but, then again: winamp is ancient. and does smplayer (a linux port) use kmixer?
hey, if it's a workaround i'll take it...
i'm mixing in asio, mostly. through cubase. i just need a playback strategy. if foobar is foobared because of windows (see, i know i could often hear a difference, but i can't quantify this - and it seems much worse now than it ever did before), and smplayer gets around it, then great.