As it uses loose shirabeo (a set of ropes used for Kotsuzumi [a small hand drum], Otsuzumi [a large hand drum] and Shime-daiko [a rope-tuned drum]) and its tone quality is soft, it is difficult to distinguish the tone of "po" from the tone of "pu."
調緒のかけかたがゆるく、やわらかい音を特色とするため、ポ・プの音は聞きわけにくい。