Try downloading the CoreAudio2 ASIO driver update
http://download.steinberg.net/downloads_software/CoreAudio2ASIO/CoreAudio2ASIO_Patch_for_Mac_OS_X_10.9.dmg
Read this also:
Try downloading the CoreAudio2 ASIO driver update
http://download.steinberg.net/downloads_software/CoreAudio2ASIO/CoreAudio2ASIO_Patch_for_Mac_OS_X_10.9.dmg
Read this also: