I would not say useless! In the end you have a good Wah-Effect…

I wanted to buy the Mission Engineering SP-H9-WH … would be a solution because of the toe-switch. But Expression+Toe-Switch won’t work 🙁

That would be a great move to make that work (I understood i worked on the H9?)

Anyhow… to make the “on/off” on the expression pedal variabel would be even better… I could think of some applications for this but Wah and Filter are the main ones.