Hey. I have problems with my external sound card (novation, nine 2/4). When I want to record vocals / guitar. When I sing / play do i hear s "metallic" buzzing. I've got a new sound card, but the same problem persists. It is probably a problem with my computer and not the sound card / cable. I have updated the drivers to the latest, uninstalled, installed the older drivers but the problem persists. I've checked the system messages and found some suspicious things (attached image). I have an imac 27 "mid 2011 running 10.8.2 Mountain Lion. "2012-okt-28 17:57:50,000 kernel: Kext com.novationmusic.nio.driver not found for unload request. 2012-okt-28 17:30:21,518 com.apple.kextd: Load com.novationmusic.nio.driver failed; removing personalities from kernel. 2012-okt-28 17:30:21,474 com.apple.kextd: Can't load /System/Library/Extensions/NovationNioAudio.kext - no code for running kernel's architecture. 2012-okt-27 18:51:15,746 com.apple.kextd: Can't load NovationNioAudio.kext - ineligible during safe boot. 2012-okt-27 18:51:15,748 com.apple.kextd: Load com.novationmusic.nio.driver failed; removing personalities from kernel. 2012-okt-27 18:56:06,040 com.apple.kextd: Can't load /System/Library/Extensions/NovationNioAudio.kext - ineligible during safe boot."