bright
high-frequency content present + audible
bright sounds have lots of energy above ~3-4kHz. cymbals + hi-hats + air + breath all live in this range. a bright mix feels open, alive, modern. too bright = harsh + ear-fatiguing.
boost a high-shelf at 6-8kHz, +2-4dB. or use a tape simulator with LESS high-end roll-off. or sample at higher rate (44.1kHz vs SP-1200's 26kHz).
they push the air band — 10kHz shelf, +3-6dB — for that 'clean modern' feel