Simon,
What brought this question about is a test with a new soundcard, a SignaLink USB. It have noticed that it is somewhat less sensitive than some previous cards I have used, which readily saturated unless I reduced the signal input. The SignaLink USB does not saturate, even at full gain, in the same application, which raises the question of whether I have enough signal. There are some issues which can be in the programs and CODECS, which is why I was wondering about something which gives you the raw ADC data.
From eyeballing the dynamic spectrum in MixW, I can get a rough estimate,
and it appears to be "good enough," in that I am not throwing away too much dynamic range. It isn't an important question, but it did seem worth asking if there was an existing program which would do this.
Alan WA4SCA