After making these edits, do you save the file as a MIDI file?
If you just click save, it saves as a SEQ file as the default. Saving it as a MIDI file (.MID) should carry these CC messages over.
Use Save As
Either that or your default synth in Studio One is not recognizing common volume control changes (CC7 or even CC11 should work)
Can you see the Events in Studio One via an editor, or do they not exist??


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