Because rapture can be either physical or mental, some of the ways of inducing it will relate to how you adjust the breath; others will relate to gladdening the mind.
"The Pāli word for “rapture” (pīti) is related to the verb pivati, to drink. Several passages in the discourses describe rapture as the food of the Radiant devas, inhabitants of a brahmā world into which meditators can be reborn through mastery of the second jhāna (DN 1; Dhp 200; AN 4:123). “Rapture” thus carries connotations of refreshment and rejuvenation. In the standard similes for the four jhānas, rapture is symbolized by movement: the movement of water through the bathman’s ball of bathing powder in the simile for the first jhāna, and the natural movement of spring water throughout the lake in the simile for the second. Only in the third jhāna, where rapture is absent, does the water of the lake fall still. Rapture can be felt both mentally and physically, a fact indicated by two passages from the discourses. The description of the seven factors for awakening in MN 118 speaks of the meditator who has attained rapture as a factor of awakening as being “enraptured in heart.” T...