About a week or so ago, I finally gave up trying to make my netbook play nicely with BIAB 2013 and realband. It had 2G of memory and I had done all the things advised on here...and it's geek score was about the same as yours.
I was having very similar problems to yourself, even with midi if I tried to use the amplitube and sampletank varieties.
I really had never intended buying a new machine when I upgraded to 2013, but netbooks seem not up to the job. I gave in and bought a machine with a geekbench score of around 8000 (hopefully will handle later versions of BIAB).....and now I can use the software without getting most of the static and distortion problems.
I would get a better machine if you can.

Good Luck

Den

Den

'Just because you're paranoid doesn't mean they are NOT after you........'

Win 10 , BIAB 2017, and that's all folks !!!