Hi blibble,
is there anyway to install rune over an existing raspberian install
No.
From our documentation:
A finely tuned system
RuneAudio runs on RuneOS, a custom built GNU Linux operating system, based on Arch Linux.
It is lightweight, and it has an ultra low latency. It’s multiplatform, optimized to run on multiple devices, and it aims for the best reasonable sound quality from each device.
RuneOS also includes a number of kernel profiles, which are switchable sets of performance tweaks acting on some system kernel parameters. This does not have anything to do with Digital Signal Processing or other sound effects – the output is kept untouched (bit perfect).
It can happen that these parameters introduce an audible impact on the overall sound quality, acting on kernel latency parameters (and probably on the amount of overall jitter). Sound results may vary depending on each setup, so users can choose a profile, according to their personal tastes.
Frank