Guys,
When I click all pages midi only, it still generates .wav files.
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That is weird! I just ran a couple more tests and each time it was a fast generation with no wavs being generated.
Note my tests were done with all MIDI styles. I just tried a test with a MIDI style that contained RT drums with MIDI charts. Using the same MIDI only method I got both wav and mid files of each track. Thus it appears that this method only works with pure MIDI styles.