Here's my bytebeat for the 256 Byte/Char Bytebeat compo for lovebyte.
If you take out the comments and put all lines into one at least my text editor says it's 255 chars. 

Kuemmel

Contact: michael.kuebel@googlemail.com

//
// - bytet(h)rashing - a 255 char byte beat by Kuemmel. Special Thanks to TomCat & Saga Musix for help & ideas & the bytebeat pouet thread !
//
a=(t*"4600890046007600460098004600760046764676987689764676467698768976"[t>>13&63]/16),
b=t/4096,
c=t>>18&1,
d=t>(1<<19),
(a&32)+c*((a+(t*(0.004)))&32)+d*c*2*("1000101010001110"[t>>11&15])*((sqrt(t&16383)<<5)&64)+d*4*random()*(-b*16&5*"6033303060303030"[b&15])

https://greggman.com/downloads/examples/html5bytebeat/html5bytebeat.html?fbclid=IwAR2H7Az93Ss5zjGhTzvCBkLAb7biBU-tgR92auZtgajlNPXVoG5C6s6isDQ#t=0&e=0&s=44100&bb=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