The gain level of the recording projects you bring in should be more or less -3db. The preferred bandwidth and sample rate: 24 bit 44.1.
There are additional fees for 24 bit DAT or ½ and ¼ analog tape sessions that are brought in without the corresponding transferring devices.
Do not overcompress your mix. Problems due to overcompression are impossible to revert. So leave it to the mastering engineer who has the appropriate tools and knowledge to do it.
For a maximum of flexibility, it is possible and suggested that you to bring the vocals from the mix on a separate track.
The preferred recording time of a CD is 74 minutes.
When bringing an audio CD project of yours for transferring, bring one that was never or hardly ever played on a CD player.
Feel free to bring any music example (CD) that could be used as a reference to the kind of sound you want to have for your project.