Has anyone created a biquad filter that returns the output as a value stream and not as an audio stream? I could really use this object for a project I'm working on and am having trouble figuring out how to compile c code into pd objects. I know taking a snapshot of every sample is possibly an option but the overhead seems much larger than doing the computation of biquad. Thanks!

This could help with turning your c code to a Pd external http://pdstatic.iem.at/externals-HOWTO/
The only way I can think of getting a whole sample block into the control domain is by writing the signal to a table and read the whole table with [until] or something.