I just thought the group would be interested to know that there is some work to make the "regular" kernel work at real-time, using a kernel modification and a file called rtkit.
See Ubuntu bugs related to rtkit, including the following 406702 -- Ubuntu-Studio-users mailing list Ubuntu-Studio-users@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users