These Cubase tutorials are a complete guide to making music with Cubase. The Quick Start section provides an overview of the editing and mixing functions in Cubase that are common to both midi and audio.
There is an in-depth section for digital audio which covers recording, mixing and mastering audio using Cubase 6. The Loops & Remix section demonstrates time, pitch and loop related tools such as Audio Warp, VariAudio, Beat Designer, and Groove Agent.
There is a comprehensive section on MIDI which explains setting up Cubase to work with Virtual Instruments, Rewire, and hardware MIDI devices as well as recording and editing.