Montreal Mastering Studio For pricing and booking information, please email us master@greymarketmastering.com Digital and analog mastering services for all formats. For analog mixdown and tape layback services, see the FAQ. Click here to have a look at a small selection of albums we've worked on. About Grey Market Mastering Serving musicians all over the world (over 900 clients from 26 countries) since 1997. All of our masters are created using state of the art analog and digital equipment. We provide CD and internet-ready masters, as well as vinyl premasters. Hear what we can do for your music.