Hiss is an improvisational quartet made up of one Englishman and three Norwegians with an instrumental line-up that is unremarkable enough, but with a sound that is fairly unique. Keyboardist/electronicist Pat Thomas is a veteran of the British free improv scene while guitarist Ivar Grydeland, bassist Tonny Kluften and percussionist Ingar Zach -- though the latter three are younger -- are mainstays of the Norwegian free jazz and improv cultures. The reasoning behind the Arabic-sounding track tit…