H9, EXP pedal + AUX switch

Is it possible to connect EXP pedal and AUX switch (with three buttons) at the same time? Or should I look for a MIDI controler instead of AUX switch? I really need the instant load for presets (one for up, one for down – and the third one for bypass) and as far as I've read about it, it can only be done with external switches. And I also need an expression pedal. So, does these two go together or can I only use pedal and one button switch?

You can only use an EXP pedal with a single button AUX switch.  So, you'll want to look for a MIDI controller instead of an AUX switch.   

Well, Disaster Area's MIDI footswitches tend to be popular with other customers.  This one for example might do what you want:

http://www.disasterareaamps.com/shop/dmc-3xl-gen3

I don't have any of their MIDI footswitches myself so you may want to contact Disaster Area support to double check with them that it'll do what you want.  Or maybe, someone who has one will comment.

There are a lot of options though with regards to MIDI footswitches.  So, one thing you'll want to consider is whether you just want a small device with 3 footswitches that does just what you're describing or something bigger with more features. The price may end up being the same…