asin(sin(t*(t&7e9|t&7e8)))

mel=t*2*[5, 12, 9, 11, 13, 7, 14, 10][t>>10&7],
arp=t*5*[5, 6, 8, 1][t>>10&3],
t=[mel*arp, mel>>arp][t>>11&1]

snare=atan(sin(t*54e2|t*54e3))*[1, 0, 1, 0][t>>13&3],
hihat=Math.floor(ceil(snare*[t>>11&3])),
melody=(atan(tan((t*.1*[.1, .2, .3, 0][t>>10&3])))),
t=(snare+hihat+melody)