I have a larger midi setup with one AMT8 and two unitor 8 stacked giving a total of 24 midi i/o ports controlled by Logic 5.51. I have recently advanced my OS to Windows XP 64bit, but the driver version 2.27 will not install as opposed to the former 32bit version. Any ideas? Is it legal for a 3rd party geek to write 64bit drivers from the original 32bit source? Is the source code available, in case Apple should decide not to support this widely used piece of hardware? Sincerely Peter Feddersen, Denmark