Hi roverdog,
Currently, there isn’t a dedicated 3 button switch pedal in development, but there are many companies that off auxiliary switches. If you are looking for a list of mappable parameters you can check out this link: https://cdn.eventideaudio.com/manuals/h90/1.3.0/content/appendix/global.html. In addition, any parameter you find in the Parameters menu of each Program can be mapped externally.
