[ubuntu] Distorted Fluidsynth Audio?

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http://ubuntuforums.org – So, I installed Ubuntu 12.04 and pretty much immediately got Fluidsynth running through Qsynth. Ever since I started out with Oneiric nearly a year ago, Fluidsynth almost invariably produces distorted audio--not unlike running a midi voice through a guitar amp. Back then, Fluidsynth sometimes appeared to spontaneously start and stop working properly, but was mostly basically not practical to use on this Macbook Pro. Anyone know any fixes? So far I've tried bringing the buffer size as far up as 8192, forcing 16 bit in qjackctl, and turning Qsynth's volume down to twenty. All at the same tim (Hardware)