Here is a link to the four post process shaders that have the red hurt hud removed. The heart beat sound still comes on at 75. That is hard coded in the engine.
https://dl.dropboxusercontent.com/u/98998019/AllPost-ProcessShadersNoRedHURT.rar
Make a back up of your other post-XXXX.fx files. There should be 4 of them.
post-bloom.fx, post-none.fx, post-rift.fx, post-sao.fx
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.