Natyashastra
अङ्गहारप्रयोगे तु भाण्डवाद्यं विधीयते । समं रक्तं विभक्तं च स्फुटं शुद्धप्रहारजम् ॥२७७॥
During the use of Aṅgahāras, instrumental music should be played. It should be even, red, divided, clear, and produced with pure strokes.
english translation
aGgahAraprayoge tu bhANDavAdyaM vidhIyate । samaM raktaM vibhaktaM ca sphuTaM zuddhaprahArajam ॥277॥
hk transliteration by Sanscript