www.megadrum.info

On the instructions for Megadrum 32 input, it shows 2 different pin inputs for a high hat pedal. High and Low Impedance

Is there any way to tell which one I would use for an Alesis Real Hat pedal. There isn't any info on their website. Would I have to take it apart or use a multimeter on the output?

https://www.alesis.com/products/view/realhat-pedal

Most pedals will work best with the low impedance input.
If this pedal turns out to be high impedance (unlikely), that is very small voltage change between positions - no big deal, just move it to the high impedance input (and change the pedal config to use Alt Input).

I heard back from Alesis...

"the RealHat Pedal variable resistance should be 0 - 62 ohms so it would be considered low impedance."

Is this also a range that the Megadrum would consider low impedance?

It is low impedance.