There are separate forums for Beyond Divinity and Divine Divinity.
You can control both characters at the same time. The tab key brings up the party menu where you can 'select all' or you can use the bottom right icon under the portraits, or IIRC click on one character portrait to be the leader and control click on the other to follow. The full game has selection hotkeys.
Accuracy is effected primarily by agility and partly by survival. Check the durability of the weapon, and make sure it is not broke.
The demo has 3 songs in ogg format in one of the folders (I think '..\Beyond Divinity Demo\Wav\music'), which you can check out. The title song and cell block area music was changed in the release game. The songs from the demo were likely used in a different location, but I don't recall them well enough to recognize them from the full game, at least in areas I have been so far.
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