Hidden Abilities can only be passed on from Females with Hidden Ability when bred with someone from the same egg group, Ditto not included.
(The female in these pairing has Hidden ability)
Audino (F) x Audino (M) = 60% chance that Child will recieve Hidden Ability.
Audino (F) x Wigglytuff (M) = 60% chance that Child will recieve Hidden Ability.
Audino (F) x Ditto = 0% chance that the child will recieve Hidden Ability
(The male in this pairing has Hidden Ability)
Any Pokemon x Audino (M) = 0% chance that the child will recieve Hidden Ability