hsc3-0.15: Help/UGen/Demand/drand.help.lhs
> Sound.SC3.UGen.Help.viewSC3Help "Drand"
> Sound.SC3.UGen.DB.ugenSummary "Drand"
> import Sound.SC3.ID
> let {n = drand 'α' dinf (mce [1, 3, 2, 7, 8])
> ;x = mouseX KR 1 400 Exponential 0.1
> ;t = impulse KR x 0
> ;f = demand t 0 n * 30 + 340}
> in audition (out 0 (sinOsc AR f 0 * 0.1))