I was looking up functions in the Nyquist reference manual, to see what would be good for plug-ins, and I came across the clarinet, text from manual shown here:

(clarinet step breath-env)

A physical model of a clarinet from STK. The step parameter is a FLONUM that controls the tube

length, and the breath-env (a SOUND) controls the air pressure and also determines the length of

the resulting sound. The breath-env signal should range from zero to one.

When I try this with (clarinet 60 0.5), Nyquist returns an error saying error, bad argument type 0.5

Does anyone know why this is, or how to make it work?