I'm looking to add real-time custom filtering as a Plug-In to ProTools 5 for WinNT. I have a table of FIR filter coefficients. Does anyone know of a Plug-In that will do this?

I know convolution with the filter coefficients (in .wav format) would accomplish the same thing. What is the difference between vocoding and convolving? Will a vocoder practically accomplish convolution? There seem to be some relatively expensive vocoding plus bundles. Any good and cheap?

john