The full paid series goes fairly in-depth and includes topics like automation, crossfades, Audiobus, and importing video, and I believe they have a free trial period to check out these (and other!) tutorial videos. The full list of tutorials is available on the lynda.com site.
lynda.com's Course Description:
And check out the free tutorial videos:Auria is the first major digital audio workstation designed specifically for the Apple iPad, and in this course, author and professional musician Garrick Chow demonstrates how to use its recording, editing, and mixing tools to create great-sounding music. First, Garrick reviews the hardware you'll need to start capturing audio, from microphones to cables and input devices. He then demonstrates how to record anything from a single audio track to a complete multitrack capture of a live band performance. Once the recordings are done, he shows you how to edit them by adding splits and trims, as well as how to apply effects and use automation in creating a final mix. Lastly, Garrick reviews the options for exporting your project from Auria in several formats to share it with the world.
Simultaneous multi-track recording:
Working with the PSP ChannelStrip:
Editing with Cut, Copy, and Paste:
Recording a track: