OK Coyote WT is a start, it has the ability to play different GM sounds.
Are you assigning the sound by right-clicking the track and selecting the [right-click] Patch Select Dialogue, or by another method?
If you are using the above method; when the Patch Select pop up displays, do you see the Patch List as showing General MIDI or something else?

Lastly, do you have the check box in Options-Preferences-MIDI-MIDI Devices enabled for "Reroute all MIDI to default synth"?

With those steps you *should start hearing different sounds using Coyote WT as the default synth.
At least those are the basics, unless something else is set wrong. But usually that gets you on the right track.

Make your sound your own!
.. I do not work here, but the benefits are still awesome