Actually, you're just using the wrong synth for what you want to do.
Dreamstation is an analog synth, and it does electronic tones and beeps. It does not respond to the bank/patch settings in the track.
Use TTS-1 instead. It is a GM2 synth, and the patch settings are relevant to it.
You might find this article useful:
http://en.wikipedia.org/wiki/General_MIDI_Level_2