Wareegyada dhaadheer waa in ay isku xiraan laba ama in ka badan oo fiilada ah oo isku xira midba midka kale, kaas oo u baahan xiriir toos ah. Xidhiidhiyaha tooska ah ee tooska ah waa qalab isku xidha laba fiilood si ay u sameeyaan wareeg joogto ah, gaar ahaan xidhiidhiyaha qoloftiisa birta xidhiidhiyaha ahi ay koronto ahaan joogto ula socoto gaashaanka birta iyo gaashaanka dahaarka ee fiilada ku xidhan. Si loo dhimo awoodda koronto-dhaliyaha ee galleyda birta ah, khadadka korantada sare waxay u baahan yihiin kala-goysyada dahaarka si loo xaqiijiyo isku xirka transposition transposition, si loo baabi'iyo wareegga hadda jira ee ay dhaliso xoogga koronto-dhaliyaha. Xidhiidhiyaha dahaaran Xidhiidhiyaha koronto ahaan ka gooya galka birta, gaashaanka birta iyo gaashaanka dahaadhka fiilada. Kala-goysyada fiilooyinka, marka loo eego doorka ay ku leeyihiin xariiqda, marka lagu daro kala-goysyada dahaarka iyo kala-goysyada tooska ah, waxay yeelan karaan laamo laamood iyo ka badan kala-goysyada.
