reViSiT integrates a Tracker sequencing environment with the VST host sequencer application: receiving synchronization information directly from the host, and returning high-quality 'tracked' audio. The net result is that the composer can retain the familiar sequenced tracks and "multi-tracking" audio utilities of the host, while simultaneously benefiting from the advantages offered by trackers.
The Professional Edition adds several features - notably surround sound, flexible output and audio bus routing, pattern management, and MIDI-controlled pattern playback. For a limited period, it is available for a special introductory price of £24.99 (roughly €29 / $39). A comparison table of the features available in the Standard (Free) and Pro versions can be viewed here.