This is Linux related, but very joyous news.
We generally refer to Cog as the closest we'll get to foobar2000 on Mac, but it's just not quite there in terms of customisation.
It's been some time now since I left Mac behind, but the issue was the same with Linux distros until now.
So to those of you who dual boot Mac and Linux, this is indeed the closest anyone has ever gotten to an actual foobar2000 equivalent: DeaDBeeF (deadbeef.sourceforge.net). It is essentially foobar2000 on Linux. And it works ridiculously well.
I can't express my joy in text form.
You'll have to check it out for yourselves