Gorgeous sound washes by producer-arranger Ben Watt; self-assured yet vulnerable vocals from Tracey Thorn. House-music purists will call Everything but the Girl's latest, ''Temperamental,'' watered-down, but pop fans will appreciate the way Watt loosens house's relentless thud. And if EBTG are broadening the appeal of an underground sound -- well, that's how music develops, isn't it? B+