Pure

einfach

(phonetics: of a single, simple sound or tone)

pur

(free of flaws or imperfections)

pur

(of sound: without harmonics or overtones)

rein

(free of flaws or imperfections)

rein

(free of foreign material or pollutants)

rein

(free of immoral behavior or qualities; clean)

rein

(of a branch of science: done for its own sake)

rein

(of sound: without harmonics or overtones)

sauber

(of sound: without harmonics or overtones)