I've actually been experiencing a very weird problem with SD2 and the Made of Metal EZX. Basically, I decided to send some of the kit pieces to their own respective audio-out channels for some minor additional processing and Sonar (Platinum, 2k15, X4 whatever you want to call it) started stuttering and dropping out the next time I started playback to make sure everything was sent out correctly. I hadn't applied any additional third-party plugins yet. Raising the buffer setting in ASIO solved the problem. It's very weird because I have sent all of my audio out like that for the past couple of years (since I've been using SD2) in various hosts (including Sonar) with other SDXs and never had an issue or a hickup. But the first time I try to send an EZX to multi-outs, it starts choking. (Made of Metal is the only EZX I own, btw, so I can't try this with other EZXs)