I'd first check that MIDI is getting into the interface. The 0404 has MIDI status lights, so check to see that they're lighting up when you hit a note on the CS1. Assuming that they are, make sure you've enabled the keyboard in Acid's settings. Here's a link to an Acid Pro help site with specific instructions on setting up MIDI keyboards http://acidpro.helpmax.net/en/how-do-i/how-to-set-up-a-midi-keyboard/
. Hope that helps.
[ Post last edited on 05/01/2014 at 05:46:56 ]