i purchased this adaptor from fxpansion and my VST's from Steinberg Virtual Guitar Electric and acoustic version, and Hypersonic will slow the operation of GB to a halt. They become unusable. GB will not function. it is published by fxpansion on the net and on the CD cover that this adaptor will work with GB WITH STEINBERG VST's. unfortunately in my situation and i assume for the masses with GB and OSX.2.8 IT DOES NOT! If you dont understand what i am talking about, VST's are plug ins that can be: 1- sounds like real guitars strumming guitars ,bass,piano etc etc etc 2- drum machines like Groove agent 3- Hypersonic- a very usuable synthesizer with thousands of sounds! THESE GET CONVERTED TO AU'S and work as software instruments in GB. I get as far as loading them into a song and then the whole system slows down to a crawl. Unusable It will take minutes to do any action on the MAC. I run a 1.8GHZ 2GBRAM G5 with no other apps running. Version 1.01 GB on OSX.2.8 the company is not helping me fix this. Hypersonic has no response as yet It freezes GB. it is a shame since these AU's make GB sound more fantastic and realistic and opens the doors to so much more music than its present capability. I am willing to have patience but tech support has told me to buy another VST and sell Hypersonic. In other words, trash the Hypersonic and put my money on some other unknown and probably unworkable software. Isnt this a shame?