Call up the Pattern you have loaded, touch “Play/Rec” > “Pattern”
Recall your Pattern so you can see it Name at the top

Press [HOME]
Press [CATEGORY]
Set “Bank/Favorite” = All
Set “Attribute” = All
Select “Init” > “Multi/GM”

Press [HOME]
Touch “Play /Rec”

You now have an instrument in each of the 16 potential Parts.
You will need to substitute the sounds you want for each Part.

Okay! That absolutely worked.
I notice that the MIDI channel that the clip is set to in Cubase migrates with the MIDI file.
I wanted it to play Part 9 in my performance so I set the channel to 9 in Cubase and exported the .mid again.
Brought it into my performance and it works as expected.

When I set up effects on Part 9, they don't "stick." When I play the pattern there are no effects, and when I navigate back to the effects tab, everything I set up is cleared out.

Edit: It was controller data embedded in the .mid file. I pulled it into Sonar and deleted it all. Now it works like a champ.
Only thing left to do is trigger it with the high C key.

Almost there.

I read one of your other threads where you explain how Scene length and looping work.
Is the only way to prevent my pattern from looping to go in and edit it, place a silent note way out in time to trick the sequencer into playing empty space after the pattern plays once?

Is the only way to prevent my pattern from looping to go in and edit it, place a silent note way out in time to trick the sequencer into playing empty space after the pattern plays once?

If you don’t want it to Loop, simple logic would say load it into the linear MIDI SONG.

When you first loaded the .mid File you selected Pattern. One would select Pattern when you want the data to Loop.
You would select Song when you want the data to play through once and then Stop.

This way you don’t have to feel you need to “trick the sequencer” — it is precisely for this reason it has the two different modes:
MIDI Song = linear
Pattern = loops

Extra Credit:
Pattern data can be moved to a linear MIDI Song using the EDIT/JOB functions.
Song data can be moved into a looping Pattern. You do so by designated a region of measures and selecting the Track or Tracks you wish to move.

The two modes (looping and linear) are made to work with each other.
When you want to freely jam and record some ideas, the linear MIDI Song is ideal. Later you can capture the best moments by copying them into a Pattern Scene - where you can work on the data.

Conversely, when you know exactly what you want to play, you can utilize the Patterns to record specific Length musical sections. You can build Scenes (which can be anything from a 1 measure fill-in to a complete 256 adagio movement) Scenes can then be “Chained” (placed in a specific playback order, then converted to a MIDI Song.