This latest web prototype I have been working on, uses Reason's Remote SDK with Web UI to provide keyboard navigation and speech feedback of the main mixer, sequencer transport and other items available in the document scope as well as instruments etc.
The UI has 3 tabs each made up of 128 potential controls set out in an 8 by 16 grid. The tabs switch between mixer, transport and instruments. You can add multiple pages of controls for both the mixer and instruments.
Here's a quick little video of me showing the web UI working with Reason.
If you are interested in this project, please get back to us.