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Next step - how can I save all of the parts together to a .wav file, keeping the intruments sounds I want, without everything reverting to piano?




When using an external synth, you'll have to record the instruments as they play the seq file.

Run an audio cable from the synth to the line in of the soundcard, and record it.
Then you can mute the MIDI.
Many of us like to record each instrument to its own audio track first (for more control), but you can record them all at once if you like.
Then use the 'Audio - merge audio and DXi to stereo wave file' command.

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