The word(s) "tone" appears 40 time(s) in 36 verse(s) in Quran in Mohsin Khan translation.

(31) Verily, We sent against them a violent storm of stones (which destroyed them all), except the family of Lut (Lot), them We saved in the last hour of the night,

(32) (They will be) on thrones woven with gold and precious stones.

(33) O you who believe! Ward off yourselves and your families against a Fire (Hell) whose fuel is men and stones, over which are (appointed) angels stern (and) severe, who disobey not, (from executing) the Commands they receive from Allah, but do that which they are commanded.

(34) So they departed, conversing in secret low tones (saying):

(35) Or a little more. And recite the Qur'an (aloud) in a slow, (pleasant tone and) style.

(36) Striking them with stones of Sijjil (baked clay).