Essentially, your music becomes the test bed for refining a new design. I can literally tune the technology to the specific needs of the album. This involves a lot of listening, so I can become even more familiar with the needs of the music. I call this Signature mastering. Availability is limited.
Pricing is twice the rates quoted above.
If you like the approach, but your production budget can't take the hit, consider the Extended mastering option outlined on the DRT website. The ears and experience are the same. The tradeoff is less time and fewer toys. 24-bit sound files at sample rates up to 96kHz are also common, usually delivered in CDR format. 16-bit premasters on DAT or CDR are also acceptable.