Audio Mastering from Airshow. Airshow Mastering proudly announces the immediate availability of complete SACDtm mastering services for independent and label projects. Airshow Mastering provides world-class CD mastering, digital editing and audio restoration services to GRAMMY-calibre clients from studios in Boulder, Colorado and Washington, D.C.. Airshow features HDCD, Sonic Solutions, DS7 and other top-notch gear.