Layback Mastering is the process of transferring your project to analog tape, then back into the computer just prior to creating
the final master.  The extra charge is due to the high cost of tape, the maintenance required on analog recorders, and last but
not least, the time it takes to transfer your project to tape and back again in real time.  Because of the cost, Layback Mastering
isn't for everyone.  However, if your project was recorded and mixed entirely in the digital domain, it would definitely benefit
from Layback Mastering.  It will give your music that warm, dynamic, round sound that only analog tape can provide.