feat: waveshaper contains softclipping

SoundGen/Fx.fs

@@ -1,15 +1,20 @@
 module SoundGen.Fx
+
 open Settings
+
 type Effect =
     | Saturator
     | Reverb
 
-type Reverb = { Wet: float; Room: float }
-type Saturator = { Gain: float }
+type ReverbParam = { Wet: float; Room: float }
+type SaturatorParam = { Gain: float }
+type WaveshaperParam = {Gain: float; Factor: float;}
 
-let saturate (param: Saturator, x: float) = tanh (param.Gain * x)
+let saturator (param: SaturatorParam) (x: float) = tanh (param.Gain * x)
 
-let sineWaveShape gain factor x = x + gain * sin (factor * x)
+let waveshaper (param: WaveshaperParam) x =
+    (x + param.Gain * sin (param.Factor * x))
+    |> saturator { Gain = 1.0 }
 
 let reverb (buffer: float seq) =
     let delayMilliseconds = 500. //((1./8.) * beatDuration) // 500 is half a second

SoundGen/Program.fs

@@ -6,45 +6,130 @@ open SoundGen.Fx
 open Synth
 
 let song =
-    [ note 3 0.5
+    [ //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
      note 3 0.5
-      note 15 0.5
-      note 15 0.5
-
-      note 6 0.5
-      note 18 0.5
-      note 3 0.5
-      note 15 0.5
-
-      note (-1) 0.5
-      note (-1) 0.5
-      note 11 0.5
-      note 15 0.5
-
      note (-2) 0.5
-      note (-2) 0.5
-      note 10 0.5
-      note 15 0.5
      //
-      note 3 0.5
-      note 3 0.5
-      note 15 0.5
-      note 15 0.5
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
      
-      note 6 0.5
-      note 18 0.5
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
      note 3 0.5
-      note 15 0.5
-
-      note (-1) 0.5
-      note (-1) 0.5
-      note 11 0.5
-      note 15 0.5
-
      note (-2) 0.5
+     //
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
      note (-2) 0.5
-      note 10 0.5
-      note 15 0.5 ]
+     //
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
+     note (-2) 0.5
+     ]
     |> Seq.concat
 
 
@@ -56,8 +141,6 @@ let writeToFile (ms: MemoryStream) =
 
 song
 //|> reverb
-|> Seq.map (fun x ->
-    let x1 = sineWaveShape 1.5 2.5 x
-    saturate ({ Gain = 1.0 }, x1))
+|> Seq.map (waveshaper {Gain=1.5; Factor=2.5})
 |> createWAV
 |> writeToFile