You are correct. I did not actually read it. This from the PSR for SP1272. I expect it would be the same.
Group 2 -- Page Zero Options
To change the option setting, press the Spin Reels button. To move to the next page zero option, turn the
jackpot reset key. To move to Group 3 at any time within the zero pages, press the self test button.
Reel-Spin Sound <0> [2] Options are reel-spin tones and reel-stop sounds {0} or reel-spin tones
only {1}.
Volume Control <0> [3] Sets the volume for all sounds and music produced by the sound
generator (for the reel game). Options range from loudest volume
level {1} to lowest volume level {9}.