1. What should I exactly buy to add to my current setup (see details above) in order to have the ensemble (Emu+PC) working?
A Second Syquest Drive that you can connect via USB to PC (I don't know if that exists... My solution: 2 Iomega Zip Drives (similar to syquest) - one scsi for the EIII, one usb for PC)
2. I have got the original Emu3 CD's, minus disk #3. Any ideas where can I find it?
Ebay.
4. I wanted to sample monophonic analog synths into the Emu, but am told its A/D converters used for its jack inputs are relatively poor quality for this task. Any way to upgrade the factory A/D converters?
?!?! Aha.. No, I don't know.
If you want to communicate EIII <-> PC, check this out:
http://users.skynet.be/emxp/ Greetz,
Elm.