Choosing An Audio Backend: For many people new to Audio Recording with Linux it can be a bit confusing and daunting to initially set up the full-featured DAWs Ardour and Mixbus. Both powerful programs share the same core so we will use Ardour as an example. Recently Ardour and Mixbus have gained the ability to be used with either JACK, ALSA and most recently PulseAudio 'backends'. If you don’t wish to use Ardour or Mixbus with JACK then choose one of the other Audio backends and ignore the JACK specific instructions in this section. As stated in the previous chapter AVL-MXE is centered around using the JACK Audio server, because JACK has interconnectivity with other external JACK-aware programs it is recommended to prefer the JACK backend for using Ardour/Mixbus and to have JACK up and running before Ardour and Mixbus are launched. When you initially launch Ardour or Mixbus either in a Live Session or a fresh HDD install you will be greeted by an initial welcome screen and walked through a few setup dialogs, in most cases except for what is detailed here you can accept the default setup choices as offered.
When you set up your initial Ardour/Mixbus session you will be presented with an 'Audio/MIDI Setup' dialog, this is where you will choose whichever Audio backend you will use. As stated JACK is the preferred recommendation, ALSA can be selected but has the following caveat: No Audio/MIDI from any other external programs or applications can be routed in or out of Ardour/Mixbus. In the ALSA setup example below we are using the same USB Audio device for both Input and Output which is a suggested practice. It is possible to select a different Input than the Output, people using USB Microphones may want to use the mic with an Input and the System Audio device as an Output. Take note that since this is a USB Audio device we set the 'Periods' dropdown selection to '3', for internal or PCI(e) Audio devices it is recommended to use a setting of '2'. If required it is also possible (but not usually necessary) to accurately calibrate Audio/MIDI latency using a cable looped from your Audio/MIDI outputs to the inputs to calculate the actual latencies. Once you have your settings selected click the 'Start' button to your upperright.
If you already have JACK up and running before setting up your intial Ardour/Mixbus session when you select the 'JACK' backend it will detect that JACK is already running and simply clicking the 'Connect to JACK' button will connect you to whatever settings and Audio device you've chosen in Qjackctl.
A very important part of the initial setup process is to have Ardour scan for Audio plugins, the scan will ensure that the hundreds of pre-installed Audio Plugins included in AVL-MXE will all be present and ready to use in your Ardour sessions. Ardour will auto-detect LADSPA and LV2 Audio plugins, LinuxVST plugins specifically will be found during the scan. It is important to note that any LinuxVST plugins you may have added yourself that aren't located in the standard paths of /usr/local/lib/vst or /usr/lib/vst will require you to to point Ardour/Mixbus to their folders by adding a custom path after launching the program, custom paths are set in 'Edit' → 'Preferences' → 'Plugins'
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