Which Arduino(or RasPi) would be best suited for audio use inside an electric guitar. With ref to storing wav forms / sound, effects, record, wifi, etc.
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I would probably start with defining the requirements for your microcontroller (uC) a bit more. What sort of bitrate are you looking for? Can a uC even create wav files? What IO do you need? Will the uC need to add these effects in real time or can you post process it?
I imagine that you might need something a bit more complicated than a single chip / single board solution. Probably some sort of high speed ADC and a uC to handle the processing and wifi.
Give it some more thought, it won't be easy, but it's not impossible either.