Hearing and chanting, even if mechanical, is beneficial, though not fully

Revival of the dormant affection or love of Godhead does not depend on the mechanical system of hearing and chanting, but it solely and wholly depends on the causeless mercy of the Lord. When the Lord is fully satisfied with the sincere efforts of the devotee, He may endow him with His loving transcendental service. But even with the prescribed forms of hearing and chanting, there is at once mitigation of the superfluous and unwanted miseries of material existence.

Srimad Bhagavatam 1.7.6 purport