Hello, I am new to these forums, and I am sorry if this is the wrong place to post. I am trying to rewrite a piece of custom Mac software from the early 1990s that records button inputs using a digital I/O PCI card. The old system used a National Instruments card, but I am finding that such digital I/O cards don't exist anymore for modern Mac Pros. The closest to my needs I can find is the Apogee digital I/O card intended for audio. http://apogeedigital.com/products/symphony-system-features.php Would it be possible to connect buttons to this card, and then read in their states through Core Audio?