
1) Chanting 2) It happens by chants 3) Reading without emotion 
Found on 
https://www.crosswordclues.com/clue/intoning

• (p. pr. & vb. n.) of Intone
Found on 
http://thinkexist.com/dictionary/meaning/intoning/

Uttering prayers, sutras, and so on in the form of a musical recitative. The practice of intoning is very ancient and is practised among the great majority of cultures,...
Found on 
http://www.encyclo.co.uk/local/20688

Intoning is a musical modulation of the voice, differing from chanting chiefly in the fact that in the latter case the cadence is more developed, the divisions more rhythmical, and the music in continuous harmony. The practice prevails in the Greek, Roman, Anglican, and Lutheran Churches.
Found on 
http://www.probertencyclopaedia.com/browse/VI.HTM

intoning To utter in musical tones; to sing, chant; spec. To recite in a singing voice (especially, a psalm, prayer, etc. in a liturgy); usually to recite in monotone.
Found on 
http://www.wordinfo.info/words/index/info/view_unit/2160/
  No exact match found.