Users who own previous versions of the AIR Instrument Expansion Pack, the AIEP 3 SELECT or a single AIR Music Technology instrument can upgrade for just $149.99 by entering their existing products serial number when asked for a promotional code during checkout. I can’t recommend it highly enough - I use it every day of my life!' Andy Richards An awe-inspiring collection of virtual instruments and high quality sound design tools and FX, this is, in my opinion, an essential buy for anyone making music in their computer, regardless of what platform they’re using. 'Air Music Technology’s latest incarnation of its Air Instrument Expansion Pack 3 is nothing short of phenomenal.