Scott,
I just googled your device and got to the Behrenger website. Unfortunately, they don't have any of their owner's manuals online. I was going to find the specific information and page you need to help you figure out how to program pedals 1, 2, and 10 the way you wish.
According to their marketing spec, each pedal (including the expression pedals) can transmit MIDI information.
So what you need to do is put the pedal you wish to work with, into Program mode, wherein you will want to set 3 parameters, at least.
Example: Let's start with Pedal 1. When you step on Pedal 1 you want to send a queue to your Alesis Midiverb to call up a particular memorized program.
What you need to know - both devices need to communicate to each other on the same MIDI channel. So, let's say your MidiVerb is programmed to transmit on channel 1, you'll want to make sure that your Behrenger is also programmed to transmit & receive on channel 1.
Next, let's say the MidiVerb program you wish to call up from Pedal #1 is patch #34, a large hall.
Your Behrenger pedal #1 will need to be programmed to send program change information. (Remember, it's already set to universally transmit on channgel 1). So now you're basically programming this pedal to send Program change information that you Midiverb will receive and respond to. I don't remember the MIDI specs, but your owner's manual should have some information on it. It will look something like "Controller change #, Bank and Program change #'s, to be simple. It could also transmit more information making it more complex, as is the case with your expression pedals.
For example, on the expression pedal, as you move the pedal from fully up to fully down, it will send MIDI data numbers 1 to 128. Fully up equals 1, and fully down 128. The receiving device will then respond to the MIDI data number it is receiving. 128 would cause your Midiverb to max out, and the value of 1 (fully up), to be minimized. This was an example, mind you.
Remember, you have to first get both pieces of equipment speaking to each other on a universal or global channel, i.e. channel 1. Next, you have to connect your MIDI cables correctly to the two devices. MIDI out connects to the other's "in". Then, you program your pedals to transmit the specific information you want the Midiverb to respond to. Not having your manual in front of me, I cannot help you very much with this part.