Each drum is on a separate track as I mentioned. Yes, each TTS-1 drum is on MIDI channel 10. However, when I move the slider for any one of the drum tracks, only that track is affected by the volume change. I would have to adjust each individual slider for each drum part which is not what I wanted to do.
The work around that I mentioned was to BOUNCE all the separate MIDI drum tracks to one track (.wav). Though not ideal, this is the only way I could find to achieve a global volume change for all the drums collectively. If I adjust the channel that Cakewalk TTS-1 is on, then other instruments besides the drums that are also using TTS-1 are affected.