found this thread where
serato.com
damon tedesco 1:29 PM - 2 April, 2014
Hey everyone! This worked!!!
1. Connect/power on hardware
2. Open Audio MIDI setup > Window> Show MIDI Window
3. Re-set the Change Configuration drop down from 'Default' to 'New Configuration' (I named it VCI-300 and saved the configuration and it worked.
This issue only effects users who have connected their hardware for the first time on OSX Mavericks 10.9.2
Thanks Sam GG and Serato for your help! Damon