Been using Ketron (formerly,Solton) for years. Now, i use a keyboard, but the 13 note pedalboard allows you to access starts, stops, fills, breaks...any 13 functions you choose while using your midi guitar or a unique set of conventional looking bass pedals that allow you to use your right toes and heels for minors, 7th's, etc.. It's a proprietary board for use with either Ketron keyboards or modules (X-1, Midjay, etc.)
They've been in the business a long time. The first unit I was aware of was the Auto Orchestra.
The beast thing to do is contact AJ via the Ketron forum. He's the expert and will be glad to take the time to explain functions, etc.
For what you want to do, I believe this is the best available solution. It's the choice of pro's around the world.
Russ