Just purchased the M-Audio FastTrack Studio for my iMac. It got some pretty bad reviews but I'm on a budget, and it's definitely better than the crappy Stereo headset I was using beforehand. My problem is this: when recording I often encounter "crackling" at high points of volume or certain frequency extremes (too low or too high). I know it's not a problem with the microphone, however, beacuse when I use the interface's built-in monitor, everything sounds crisp and clear. Recording, however, I often encounter the crackling especially if I sing while playing the guitar (acoustic). The Windows drivers for the thing allow you to set a higher latency setting, but the Mac drivers don't (what the hell?). I thought it might be a connection problem, so I used a male-to-male stereo 1/8" mini-jack cable to connect the FastTrack's output to the iMac's line-in. I still get some crackling (and yes, I did make sure it was recording from line-in in the System Preferences/GarageBand). So, it's not the microphone or the connection. My last guess is it's something to do with my iMac. I even went into the Audio MIDI Setup and fiddled with the FastTrack's buffer size. The highest setting just seems to make my voice really deep and soulful (and frankly, sound ridiculous) and the lowest accelerates the recording and makes me sound like a chipmunk for some reason. I'm lost. I was going to go buy a popscreen for the mic beacuse I thought that might be the problem but obviously not (since it sounds perfect through headphones in the interface's monitor)... so... What's the deal? Any help? How can I change the interface's latency setting on a Mac?