> import Sound.SC3 {- hsc3 -}

> g_01 =
>     let x = mouseX KR 0 0.1 Linear 0.1
>         y = mouseY KR 0 0.1 Linear 0.1
>     in sinOsc AR 440 0 * hypot x y

Object travels 200 meters in 6 secs (=120kph) passing 10 meters
from the listener.  The speed of sound is 344 meters/sec.

> g_02 =
>     let x = 10
>         y = lfSaw KR (1 / 6) 0 * 100
>         d = hypot x y
>         a = 10 / (squared d)
>         v = slope d
>         r = (344 - v) / 344
>     in fSinOsc AR (1000 * r) 0 * a

> g_03 =
>     let x = 10
>         y = lfSaw KR (1 / 6) 0 * 100
>         d = hypot x y
>         a = 40 / (squared d)
>         s = rlpf (fSinOsc AR 200 0 * lfPulse AR 31.3 0 0.4) 400 0.3
>     in delayL s (110 / 344) (d / 344) * a