I'm getting something similar: I just installed EWQL, and the first couple of times I played the beginning of Holst's Jupiter that I originally entered for Notion's samples, it worked fine. But when I exported to a WAV file I noticed some static in the loud parts (looking at the WAV file in Audacity...

You should consider getting a small USB MIDI keyboard, like the Alesis Q25. Amazon currently lists it at about $64. It's small enough that it fits between my computer keyboard and monitor. You just plug it into a USB port and Notion (and all the other applications on your system) will recognize it a...