radium49 i need driver for yosemite,please

M-Audio have not released updated drivers for the Radium 49.....

Contact them for further information and/or sign up for notifications when/if they do via this page....

http://m-audio.com/kb/article/1754

This is a late reply, but perhaps it helps someone. You can use this driver: http://m-audio.com/support/download/drivers/midi-usb-driver-v3.5.3-mac1. I just installed it and now I can use my M-Audio Radium 49 with OS X Yosemite 10.10.3. Installation requires restart. Good Luck!