Hexler recently released a major update to their TouchOSC app - TouchOSC Mk2! The editor/controller now runs on all devices and platforms so creating and editing templates is much easier. They also added Lua scripting with an event-driven model to allow for customization of behaviors. The cost is small, less than $30 USD for the PC and iPad apps, and installation and setup are easy with instructions on the Hexler web site (hexler.net).
As a sample, I uploaded a small template, along with an example patch, to Patchstorage. The patch uses only free modules. The TouchOSC template uses only MIDI CC messages as that’s the easiest to work with for now.
The patch is here: VCV-1 TouchOSC | Patchstorage