I did mean WV, which stands for WavPack
I use on a daily basis MP3s, FLACs, WVs; so ability to see all of them on a spectrogram is a must. And it would a convenient if I could also analyze WAVs, because I often extract audio from video to that format, in which I later edit that audio [if it looks good enough on a spectrogram]
So far, Spek gives me the most efficient / visual form, for all of my formats. If only it could also play audio...
As for maximizing window, I don't know if I understand: I have to use a workaround? Because I shouldn't expect for the real maximize option to work [be remembered]; but instead of it I should "cheat" by making the window so big that it only looks like it is maximized but in reality is not? If yes, then it doesn't work for me. I have as 21:9 monitor, which gives me some issues of that kind with some older software. So when I reopen the Sonic Visualizer after maximizing it or fake maximizing, it shows itself in a 16:9 aspect ratio. And on top of that I have a thin Winamp bar always docked on top of my screen, that also sometimes generates some issues of that kind; and there is just no way I will be closing Winamp every time I need to quickly take a look at spectrogram
[Right now I'm testing some solution to the problem of Notepad not being able to remember to open itself always in a maximized way, so maybe something will come out of it]]