If the audio on your ADAT was recorded at 48k then you must record at 48k. You will have to record your tracks in at 48k and then convert the files to 44.1 if you want to eventually burn a CD. You will probably find it easiest if you end up doing this after you create a stereo mix of your song using a Bounce to Disk feature. In the Configure Hardware Driver, or the PCI-324 console you must set the Sample Rate to 48k. Once you sample rate convert your audio to 44.1k, you will have to set the sample rate in the console back to 44.1 so you can play the file. You always want your digital clocks and sample rates to match when dealing with any kind of digital audio transfer or synchronizing.