I am quite sure that PureData is the tool you are looking for!
Getting the amplitude value at certain moments and storing them to a
table (storage in pd-speak) is a very easy thing.
Recording could also been done within Pd, in .wav format and then be
encoded by a shell command such as oggenc.
I am not sure howto implement the image (.jpg) display right now, but it
can't be too hard and is possible for sure (using the Pd-addon library Gem)
good luck, post again for more questions if you like!
lg,Peter
