It's better to wait and get what you expect then to get something fast and inferior.
Also with FLAC compression you should be fine.
Or even simpler, if you use 7zip it probably will already get you there without extra stuff to do.
Most voicebanks are big because people fail to delete star, platinum, spectrum, etc, files. Not just because of the actual audio content.
3rd world countries and data caps are factors that encourage people to compress files. If you look inside the batch scripts, you can see that it deletes unnecessary files (like llsm and uspec) after it executes the main function.
7zip is one of the best solutions for creating SFX archives, yes. But we chose WinRAR for its availability at the moment. Experienced users are always welcome to wander from our path. They are also welcome to alter/modify the script to suit their tastes (albeit it's a dangerous thing to do)
We provide these scripts "as-is" and will not be held responsible for damage of the system of the end user. The scripts we provide are safe, and are harmless to the system.
You can also take a look at the FLAC version I recently made with your suggestions (moresampler-esque drag&drop). It's in here: http://utaforum.net/threads/flac-lossless-voicebank-compression.16172/
If you have a better alternative to FLAC, please let me know.
edit: @Zoku, please look at the script and take a look at the input variable. I've been reading the "help" section of the executable, and I am aware that 0 is the highest quality. In the script, 1 is the lowest quality. I did math functions to make it that way. A pretty simple one at that.
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