In the PCI-324 console, you set the Clock Source to PCI-324 ADAT for sample accurate sync. You must have the sync out of your last ADAT connected to the Alesis 9-pin jack on your PCI-324 card. The Sample Rate seting must match the sample rate of your Adats. Digital Performer and AudioDesk users must choose "Sample Accurate" in the Receive Sync window found under the Basics Menu.

If you don't have a BRC, or an MTPAV for use with MMC, you will put Digital Performer or Audio Desk in slave to external sync, hit record, and hit play on the ADAT. ***Note the above scenario only applies to AudioDesk or Digital Performer, which currently are the only programs that offer sample accurate sync via the ADAT sync port. If you are using another program, you will have to also send MTC or SMPTE to the program while it derives the timebase from the ADAT sync connection.