hsc3-0.11: Help/UGen/Demand/dseries.help.lhs
> Sound.SC3.UGen.Help.viewSC3Help "Dseries"
> Sound.SC3.UGen.DB.ugenSummary "Dseries"
> import Sound.SC3.ID
> let {n = dseries 'a' 15 0 1
> ;x = mouseX' KR 1 40 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))