Tetra Controller is an editor for the Dave Smith Instruments Tetra analog synthesizer module.
- The app itself doesn't make sound and it's only purpose is to edit patches on the synthesizer itself
- Connect your iPad to your synthesizer using a MIDI cable, set up the MIDI settings and MIDI channel and refresh the editor to see the current patch in detail
- Use the controls in the app to change parameters
- Rename your patches using the naming dialog
- Save your patches on the Tetra to build up your patch library

(Dave Smith Instruments is a trademark of Sequential LLC)