just a quick question: is it possible to deposit 4x 0.001 BTC in single transactions in one mix session to the same deposit address and receive one 0.004 BTC chip then? or has it to be 0.004 btc in one transaction in order to get a chip?
You can, just don't go to step three where you get the keys before your coins have all confirmed (just in case you end up losing an input or something).