guitarix benefits from keyboard shortcuts for most of its operations and guitarix comes with a Jack midi in port to connect a midi controller and provide a midi learn function for every Gui controller. You can save your settings (and midi connections) in presets and load or switch between them easy with keyboard or Midi commands, and indeed over the menu. guitarix comes with a jack port connection widget to easy maintain the connections in a modular workflow and guitarix includes an guitar tuner with a analouge like Interface.
You can call meterbridge over the menu connectet with in and output from guitarix
Install guitarix in ubuntu lucid
Open the terminal and run the following commands
sudo add-apt-repository ppa:falk-t-j/lucid
sudo apt-get update
sudo apt-get install guitarix