Hello,
Congrats with the new version!
I quickly changed to using it, becoz the file size of recordings is significantly smaller.
Unfortunately, some great export functions (I just discovered) of version 3 have disappeared: label based multiple exporting. Is this gonne be re-implemented some day?
Splitting, naming and tagging files is so much more work now.
What’s more: 4.0 keeps nagging about the name of the export file. ‘Name not supported’. No spaces, no underscores, no hyphens… even only letters: ‘not supported’. Then, what ís supported? And what can I do about that?
Temporarily: back to version 3.0 (with ridiculously big files: 16 GB for 40 small songs?? exported as mp3 is about 100 Mb…)
Nevertheless: a big fan! 
And thanks a lot for the ongoing development.
Greetz, b.