Hey guys, we've made the changes required to integrate pisound into Raspberry Pi kernel and submitted a pull request. https://github.com/raspberrypi/linux/pull/1684
It is functionally equivalent to the out-of-tree kernel module which is installed with the current installation instructions, but if you'd like to try it out anyway, you may find it here: https://github.com/BlokasLabs/linux/tree/giedrius/rpi-4-4.y-pisound and you may build it using instructions provided here: https://www.raspberrypi.org/documentation/linux/kernel/building.md
Having it integrated into mainline kernel will allow us to get rid of the bulk of the steps that are currently necessary to get started.
It's done! Since kernel version 4.4.27 the pisound module will be available by default. We will simpliy the installation instructions on our page and wiki shortly!