hdf-0.11: Help/UGen/Oscillator/sin_osc.help.lhs
> import Sound.DF
> do { o <- sin_osc 440.0 0.0
> ; audition [] (out1 (o * 0.1)) }
> do { f <- sin_osc 4.0 0.0
> ; o <- sin_osc (f * 400.0 + 400.0) 0.0
> ; audition [] (out1 (o * 0.1)) }
> do { o1 <- sin_osc 440.0 0.0
> ; o2 <- sin_osc 440.0 pi
> ; audition [] (out1 (o1 + o2)) }