I'm unsure, you may have issues with your sound card driver.
Kernel 3.1.0 was recently out on Wheezy, that might help if you update.
You might try zynaddsubfx if you want some other app which runs using JACK.
You might check your JACK graph and see if you can connect your input to
your outputs, and sing with a mic. You don't need any app to test that.
VLC also has a JACK output plugin if you install it.
You may also try audacity and see how all this behaves.
As you may guess, it's not really the best place for support, and it'd
be nice to know if this isn't puredata related so we know if this bug is
valid or not.
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