> Sound.SC3.UGen.Help.viewSC3Help "Operator.atan2"
    > :t atan2

> import Sound.SC3 {- hsc3 -}

Add a pan to the hypot doppler examples by using atan2 to find the
azimuth, or direction angle, of the sound source.  Assume speakers
at +/- 45 degrees and clip the direction to between those.

> g_01 =
>     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
>         z = atan2E y x
>         l = clip2 (z / (pi / 2)) 1
>     in pan2 (delayL s (110 / 344) (d / 344)) l a