The demo is fully functional: you can save sessions, use third-party plugins, and use external controllers. The demo will occasionally generate a low-level noise which prevents you from publishing the resulting mix, but otherwise it allows you to fully evaluate Mixbus.
Mixbus is a full-featured Digital Audio Workstation (DAW) with "True Analog Mixing": a combination of Harrison's world-renowned sound and features in an affordable, knob-per-function interface. Mixbus provides unlimited audio and MIDI tracks with extensive features for recording, arranging, editing, mixing and mastering your audio.
Mixbus runs on nearly any Mac or Windows desktop computer, and it uses your existing sound I/O device.
Mixbus32C has all the features of Mixbus, with the addition of the Harrison 32Series equalizer and 4 additional stereo buses available from each mixer strip.
Both demo packages include a free copy of the SetBfree tonewheel organ instrument, plus evaluation copies of 12 highly-specialized Harrison plugins for the tasks of recording, mixing and mastering.
You can learn more and download the free demos at Harrison's Mixbus and Mixbus32C product pages: