[LAU] VC and jack

Hello, I've never used hardware that uses VC, but sometime ago I had an idea, that probably many others have allready exploited (never heard of it though). If a control signal is exactly the same as an audio signal, just very lower in frequency, one could apply all the usual audio effects to control signal. You could for example turn a knob, have the signal it generates pass through a delay, reverb or whatever, and then have it control something (like the frequency of a synth). This seems an interesting idea I'd like to play with - the problem is, how can you do it in our linux-audio environment, where usually the knob generates midi CC data? Is it possible with some tricks to convert this to an audio signal (maybe way downsampled to not uselessly waste CPU) pass it through rakarrack or ladspa plugins, reconvert it to midi CC and have it control something? A more general thought: what about implementing a new type of generic "control" signal in JACK, and having existing audio apps accept these signals in their input? If you come to think of it, there's really no difference (other than sample rate) between a control signal and an audio signal, so there's no reason why one shouldn't be able to do DSP on control signals. cheers, renato