refactor: separate files

SoundGen/Fx.fs

@@ -0,0 +1,19 @@
+module SoundGen.Fx
+
+type Effect =
+    | Saturator
+    | Reverb
+
+type Reverb = { Wet: float; Room: float }
+type Saturator = { Gain: float }
+
+let saturate (param: Saturator, x: float) = tanh (param.Gain * x)
+
+//
+// let process(effects:Effect list, sound:float seq) =
+//     let mutable output = sound
+//     effects
+//     |> List.iter((fun eff ->
+//         match eff with
+//         |Saturator -> output <- (output |> Seq.map saturate eff)))
+//