TL082 Filter

Been messing with this thing all day. It's a very simple Highpass (sounds like one to me but what do I know?) Filter built around a TL082 Dual Op-Amp IC. It doesn't sound too bad (sound sample coming soon), but there is one problem: I can only run one or two things through it. Only a crappy 555 synth and a 555 opto-theremin work with this filter (and the theremin barely works through it). I was wondering if the kind folks out there in the internet could possibly help me out and let me know what the heck I'm doing wrong.

Here's the schematic: