[linux-audio-dev] modern guitar preamps modelisation DSP techniques

Hi, I'm very interested into DSP modelisation techniques and more precisely about Guitar preamps modelisation techniques. Anyone have some resources, any SoA / Paper related to this subject ? As an example, I would like to understand what dsp underlying techniques use successful effects like : - the Amplitube VST software effect on mac/pc plateforms - For hardware effects, the Pod guitar effect from Line6 - and some others but not so many as good ... Thanks to Steve Harris from the audio-linux-dev mailing-list, I had a look to some interesting spice based modelisation of a fender 12ax7 preamp at http://quitte.de/dsp/ Does some of you have more knowledge about this ? TIA. Fabien Costantini.