I'd held back for a while waiting for the UbuntuStudioPreparation Wiki to get updated and now that some work's been done there for Precise (thanks, ttoine!) I took the plunge.
The good/great news is I was able to get jack/studio functionality running by cherry picking the following commands from that page - since I want to run Ubuntu Studio via Unity or Cinnamon and also enjoy the security of a LUKS encrypted partition I wasn't able to simply install Precise UbuntuStudio, so I had to take this approach
The only wrinkle is that I have to hold the SHIFT key on startup as soon as the bios screen comes up in order to reveal the GRUB menu, otherwise there is choice to select the lowlatency kernel and Ubuntu just boots with the latest generic kernel. I suppose I'll have to learn how to edit GRUB in order to get this to load the linux-lowlatency kernel consistently.
sudo apt-get install vlc ubuntu-restricted-extras ubuntustudio-menu
sudo -E wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring
sudo apt-get --quiet update && sudo apt-get --yes --quiet upgrade
sudo apt-get install alsa-firmware-loaders alsa-tools alsa-tools-gui alsa-firmware
sudo apt-get install linux-lowlatency linux-headers-lowlatency
sudo apt-get install pulseaudio-module-jack
sudo apt-get install qjackctl
I've also installed amsynth and am testing with my E-Mu XBoard25 controller and an ALSA virtual keyboard
Things sound good via the E-MU controller or the virtual keyboard.
sudo apt-get install amsynth
sudo apt-get install vkeybd
So now two questions/problems.
1. Yoshimi has no instruments and finding any online appears to be a trade secret. I can install and use ZynAddSubFX but if Yoshimi's so much better for connectivity how do I get a sound out of it?
2. Also, I have a Juno-106 hooked into my Audigy Soundblaster drive, which comes up in JACK with two selections for readable clients
0:Audigy MPU-401 (UART)
32:Audigy MPU-401 #2
Neither of these will pass any MIDI data when hooked up (under the ALSA tab) to either ZynAddSubFX or Amsynth. What do I need to tweak to get my larger keyboard feeding MIDI data to softsynths via JACK?