hello Juris, maybe you are still listening
(1) if you can recompile the code (this should be easy with winAVR/programmers notepad and the included makefile):

the code is no magic. the fft fourier code is based on Elmar Chan´s code and can be used in other projects too. have a look at the code (main.c) and use the ffft.S as a black box for the FFT.

(2) i implemented a button (labeled "guide" on my remote control - code 27) which sets the eeprom values to something useful. it´s not perfect but it will work. if you can recompile, it would be easy to adapt these values and just use the "guide" button to get them set.

(3) i have the ambilight close to the PC and it was easy to read out the EEprom values. you can find them here: http://katze.dead-men.de/upload/88_ambilight.e2p
use ponyprog to write the e2p file and you will have some values to start with.

(4) since i can reprogram the ambilight easily, maybe i can adapt the code for whatever seems needful to you. just ask.

@Robocat: Du hast meinen vollsten Respekt für Deine fundierte und sprachlich kreative Antwort verdient!
danke - ich finde zwar nicht, dass ich da viel respekt verdient habe, aber freue mich trotzdem. das "sprachlich kreative" rührt eher daher, dass mein englisch sehr schlecht geworden ist im lauf der letzten jahre

gruesse von der katz