I have made a patch exactly like that, using nothing but the noise generator and a keyboard-following high-resonance LP filter. What you're describing sounds like filter saturation. Have a look through the Edit menus for your filters to make sure they aren't set to saturate?
Also, make sure no other sources are set to modulate the Filter Freq. destination. For example if you also have velocity modulating the filter freq, it will totally screw with your ability to get it to play "notes".
-Annikk
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