linux-rt — package ia so called, is equally successful using apt-get, aptitude or synaptic. It is really a realtime-kernel.
In this case, the bottom line is that the reduced latency and greatly improved sound quality, regardless of the type of sound card. Particularly noticeable this effect on slower machines. But powerful computers also makes sense.
Applications for working with audio (JACK to LMMS and Audacity) to push own audio driver to the appropriate optimum state, if available rt-kernel. Ie Ubuntu just put this package, reboot and all.