Connect your microphone to one of PURE DRIVE's microphone inputs, apply the appropriate gain.
Take the analogue output/insert send from PURE DRIVE and connect it to an analogue compressor - something like an 1176 is great for tracking vocals - it helps level out the vocal performance and make it easier to mixdown later.
Take the output of the 1176 compressor and return it to the Insert Return of PURE DRIVE.
Press the INSERT button on PURE DRIVE to change the impedance button on the channel to be your INSERT in/out button. Engage the INSERT using this.
Connect the ADAT output of PURE DRIVE to your audio interface such as SSL 12 to record your post-processed signal into your DAW.
You can use any of the ADAT, AES or USB connections, it does not have to be specifically ADAT.