Hi Athanasis, this has been discussed a couple of times here. For audio analysis, you are much better off with a decent quality sound card and free audio analyser software. 24 bit resolution is regularly available, and will give you much better data to work with than what an 8-bit ADC in a scope can provide. (Of course, sound cards are limited to 192 kHz sampling frequency or so, while your scope will do 1 GHz sampling rate - but you don't need that for audio signals.)