Ubuntu 14.04 audio sink problems

Hi all,

After about the 10th time trying to install gnuradio on Ubuntu 14.04 i
finally managed to get it working with some oot blocks.

Only problem now is the audio sink doesn’t produce a clean output say at
khz its very intermittent, sounds more like a square wave or something
weird. I have messed around with gr-audio.conf but still produces the
same noise.
Im running Ubuntu 14.04 on a vmware mac

any help would be greatly appreciated