Bojcha: So to get back on your post from yesterday:
AGC 2nd band
To be done -> Put on TODO list: "Improve AGC behavior: Lock high frequency channel to low frequency channel and make sure that its volume never gets lower."
Multiband going down at loud 'S'
Question: Is this solved by increasing the 'limit output' slider?
Highs distortion
In originals, not a Stereo Tool problem.....

(Are you using MP3s? If so, are you ripping at the maximum volume? Because MP3s also change the waveform shape, which might introduce louder peaks than were present in the original. For best quality, use lossless compression like Flac, or at the very least if you do use MP3s rip at a lower level! But I know that you know this, so this is probably not it...)
Oh, about:
Loudness is at 2.00. If i push it more .. distortion is frequently more occured, but again if i turn off multiband and level output to be as should, distortion is less even when loudness is >x2.30. - I suppose this is caused by the fact that Multiband increases soft sounds? Same is true for Loudness...
Vibrating voices
Same as v4.22, will look into this later but for now I'm leaving it as it is.
BETA2 Stand Alone not working
New version is being built right now, it took a lot of time to get the same performance that I had yesterday, but I just managed to reach that same performance again. I hope it's working this time (I couldn't reproduce any of the problems you mentioned here, even with the stand alone version. Bugs like this are often very difficult to detect and find and can cause different behavior on different CPU's, Windows versions etc.) Please let me know if it works properly now...