The Roland VT-4 Companion Application unlocks hidden abilities in your Roland VT-4 Voice Transformer. The application gives you access to 8 variations in each effect, not just the four mentioned in the manual. It also lets you edit and rename the variations to your likings. The user interface makes it much easier to use your VT-4. Manual is included, just click on the VT-4 logo to bring up a PDF document. You need Adobe PDF reader to read the manual. Note that you need a VT-4 in order to use this application.