envelope filter

[heffus]

is there a free plug-in that can give me that old DOD envelope filter pedal sound?

[shamann]

Kjaerhus Classic Auto-Filter.

Not the be all end all of filters, but still excellent.

[topaz]

check out my free dynafilter.

[soma]

I also have a free envelope follower in my sig that you can use to send midi to any filter's cutoff.