Audio input hardware for rpi2 B+?

Hi all,
I have just started working with the pi (raspbian, currently armv6 as no luck compiling OF 0.9.2 for armv7) for a project where I need to do some basic FFT analysis on an audio input. I have been trawling forums and web looking for the best audio hardware to add input support for OF but am having a hard time finding anything that looks reliable. Does anyone have any hardware to recommend for use with OF in this case?
Any help hugely appreciated,

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hey @nay , not exactly what you ask, but today I have seen this recommendations about external soundcards for raspberry pi and pure data. Yo can some settings too: