Is "bouncing" something that needs to be done, anyway?

I did a mixdown from the midi notes - the whole song, and some particular notes are not heard in the mixdown / wav file.  Went back into song / track / instrument, thinking I deleted the note by accident, but it was there.  -Played the section again, right there, and nope - no notes played.  At any BPM.

I have not, however, done this bouncing thing.  Still low in the leaing curve.  I'll check that out and if no go, I'll back off a version and wait for the update.  Thanks for the info ^^, Presonus people!

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