I had to chime in here. This is my first post. I gig with a td 30 and have since it came out. I picked up a used dm10 studio kit wicked cheap for a practice kit at home.Need less to say coming from the VH-13 to the separate pedal and cymbal for the the high hat left me disappointed, so I bought the Alesis prox hats.i was disappointed with these as well , until I found out how to set them up properly!!!
The lower hat with its small connector does nothing if you're useing the original mono cable that came with your kit( that's why you see no difference when you disconnect it) , in fact it is unbearable.its triggering is unpredictable , half open hats are constantly chocking off etc,etc.
You must use the stereo TRS cable that came with the hats on the controller to the module!! The top hat input is mono,yes,but the controller input is stereo.After its connected with a TRS cable , you get extra settings for the pedal. You can set separate velocity curves for the pedal and the top trigger.which I highly recommend playing with.Very happy with the pro X hats now!they will operate all together differently and amazingly smooth when connected with the proper cable.
Hope this helps!