If you install the drivers for an Emagic USB Interface on Snow Leopard, You will get the following message every time you start your computer, and won't be able to use it.

Emagic EMI 2|6 - Audio Interface Specs - CNET
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'/Library/StartupItems/EmagicA26A62mFirmwareLoader” has not been started because it does not have the proper security settings.

Apr 27, 2007 The EMI 2 6 Firmware Loader, as the name indicates, automatically loads the EMI 2 6 Firmware into the EMI 2 6 during startup of your computer. The firmware will be kept in the EMI 2 6 as long as it is connected and powered. Once the firmware is loaded, the EMI 2 6 is available under Mac OS X using Mac OS X’s built-in USB Audio Driver.
Emagic EMI 2 6 - audio interface overview and full product specs on CNET.

But there is good news. It is possible to get it working.
First install the driver, it can be found here ftp://ftp.apple.com/emagic/A26_A62m.dmg
Next,you need to log out of your computer using the Apple menu (top left hand corner). then login using the user:root
If you don't know the password for the 'root' user you will need to reset the password. To do this, you will need to put your Snow Leopard Installer DVD into the computer and restart, hold the 'c' key while the computer starts. You will reach the screen where you choose the language, hit continue. From there, you will need to go to the utilities menu at the top and choose reset password. There you can reset the password for 'root' which is the system administrator account. restart the computer and login as 'Root'.
EMI 2|6 Driver X KOSTENLOS gratis herunterladen

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Next you will need to open the Terminal application. It can be found in the Utilities folder which is in the Applications folder.

Emagic EMI 2|6 - Audio Interface Specs - CNET

Once you are in the Terminal window you copy each of the 3 following to the terminal curser. Copy one at a time, followed by the enter key.

sudo chown -R root:wheel /Library/StartupItems/EmagicA26A62mFirmwareLoader

sudo chmod -R 755 /Library/StartupItems/EmagicA26A62mFirmwareLoader

sudo chmod 644 /Library/StartupItems/EmagicA26A62mFirmwareLoader/StartupParameters.plist

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Next, delete the relevant preference pane in /Library/PreferencePanes/ – it’s a PPC pane so there’s no need to keep it hanging around. Finally reboot & watch it spring to life.
I got the info from this site, so I'll give credit where credit is due.

http://www.fstaudio.co.uk/?p=234

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Good luck and Enjoy

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