Sound.SC3.UGen.Help.viewSC3Help "BLowShelf"
    Sound.SC3.UGen.DB.ugenSummary "BLowShelf"

> import Sound.SC3 {- hsc3 -}
> import Sound.SC3.Common.Math.Filter.BEQ {- hsc3 -}

> g_01 =
>     let i = soundIn (mce2 0 1)
>         freq = mouseX KR 40 6000 Exponential 0.2
>         rs = 1
>         db = mouseY KR 24 (-24) Linear 0.2
>     in bLowShelf i freq rs db

> g_02 =
>     let i = soundIn (mce2 0 1)
>         freq = mouseX KR 20 6000 Exponential 0.2
>         rs = mouseY KR 0.1 1 Linear 0.2
>         db = 6
>     in bLowShelf i freq rs db

calculate coefficients and use sos

> g_03 =
>     let i = soundIn (mce2 0 1)
>         freq = mouseX KR 20 6000 Exponential 0.2
>         rs = mouseY KR 0.1 1 Linear 0.2
>         db = 6
>         (a0, a1, a2, b1, b2) = bLowShelfCoef sampleRate freq rs db
>     in sos i a0 a1 a2 b1 b2