Alterations in the Environment window don't do anything to the midi

Question

The midi signals for Yamaha DTXplorer are off from GM. The snare (G0) and bass drum (A0) output notes do not trigger snare (D1) and bass drum (C1). I hear all the other drums. The snare and bass drum do record (but not on channels that make any sound).
I am a novice to both MAC and Logic Pro.
I have the midi out of the drumset going USB right into my MAC.
I've gotten as far as...
1. Environment window>clicks and Ports
2. Verifying the channels that DTX triggers for snare and bass drum.
3. Changing the output notes to D1 & C1.
Nothing changes with the sound.
In fact, I can change the output notes for drums that are set up correctly and they don't change either.
None of the alterations I do in the Environment window seem to do anything to the midi signals!
Do I need to activate or save the changes? If so, how (precisely)?
Thanks in advance.

Answer 1

1) You don't want to create an external MIDI - that would be for logic to play an external device. You want a software instrument.
B) It sounds as if you have created a 'mapped instrument' in the environment. Maybe you are using a template that has one built in. I can't help you with that because it crashes Logic for me when I use that.
So I do it like this:
Very straightforward to set up. The thing called "Alesis mapping" is a transformer, which is open. If you click initialize at the bottom you get a 1 to 1 ramp (notice that the 3rd button in the second row is set to "use map"). The numbers in the bottom right correspond to note numbers in this case. 0-127 (C-2 is 0, C#-2 is 1, etc.). I forgot to put it on one where you could see the number differences, but you can see it in the graphic map. In my case I needed to reassign 4 notes. So if the number in the bottom right says 25, the number in the next box says 56. You can see that as the column spike. Now when I grab the choke on the cymbal it sends out note #25, which this transformer turns into note #56. The hardest part of my method is converting note names (D2) into the proper number (0-127) that is what the monitor is there for - confirmation.
Under status where it has an = and then "note" is there so you don't accidentally remapped the hi-hat CC# (probably CC4). My kit sends a note for cymbal choke, but yours may send an aftertouch message, which will pass through unaltered.
Save this as a template.