I have been working on a jack client that uses the GPU to process audio. The benefit of this is that it lightens the load off the CPU to process audio. I used the NVIDIA CUDA toolchain to create a jack-cuda client. Currently I have made a gain plugin that uses 256 parallel threads to amplify a jack audio stream in realtime. There is a bit of overhead because it copies the stream to video ram first, then processes the audio and copies it back to main ram, but the PCI-e bus is pretty fast so it’s still overall pretty fast.
Feel free to try out my jack-cuda client here.
New version here with working makefile for Cuda 5.0.