The following opcodes model or emulate the sounds of other instruments (some based on the STK toolkit by Perry Cook):
bamboo
barmodel
cabasa
crunch
dripwater
gogobel
guiro
mandol
marimba
moog
sandpaper
sekere
shaker
sleighbells
stix
tambourine
vibes
voice
Other models and emulations
lorenz
planet
prepiano
Fractal Number (Mandelbrot set) generator: mandel
chuap