Hi Luca, thanks for all the great information you posted. I am a relative newbie to the Mac world and SoundBlossom is exactly what I have been looking for. The problem is that I am running El Capitan (10.11.4) and the kexts need to be signed. I installed the signed version of Soundflower (2.0b2), which puts the kext in /Library/Extensions, not /System/Library/Extensions. Since running the compiled version didn't produce any errors, it just didn't find Soundflower, I thought I would give a try at loading the source code into Xcode and replace any references to /System/Library/... with /Library/... I then ran the code and it worked. I added the additional channels, ran the terminal command
sudo nvram boot-args="kext-dev-mode=1"
to shut off the requirement for signed kexts and rebooted the machine. None of the new channels showed up. I then opened info.plist file inside the Soundflower.kext and saw that the changes were made, but they did show up. I reran SoundBlossom and it showed all of the new channels. I am not sure what to do next. Any ideas?

---Andrew