I have a DCC sound-equipped HO locomotive that includes the Sound Value SoundTraxx? diesel sound package with prototypical 567 prime mover, 3 air horns, and bell?all in polyphonic 16-bit sound.' I am using EZ Command Control Center (#44901); the engine responds as follows: prime mover sounds great, F1 - Bell, F2 - Air Horn, F3 - Short Air Horn, F8 - Mute, F10 - Headlight; no response from the other keys. I understand I need to change the CV values to access all three Air Horn sounds. My EZ Command Control Center (#44901) is adequate for my layout, but does not have the capability to change CV values. What is the most economical way to change the CV values?