Really cool !! I agree wholeheartedly about the utility of the RPi. It is such an amazing tool !!! I am making amplifiers and recording equipment which is more for character than 100% linearity. So finding tools that help me 'characterize' the interesting contraptions I make are extremely helpful. Your posts are like gold !! I mention that to encourage your efforts and sharing.. Also to let it be known that even though people may not vocally appreciate all the time >> you are appreciated. your efforts are important and cool. Blazing new trails is not exactly 'trivial'