add highpass cmd

- remove bypass arg from reverb cmd

doc/README.md

@@ -89,11 +89,20 @@ Runs the Higher Quality Pitch Scaler from the SWH plugins.
 
 The `mult` parameter is the pitch coefficient, range from 0.5..2, default 1.
 
-## `reverb split index bypass roomLength roomHeight sourceLR sourceFB listLR listFB hpf warmth diffusion`
+## `reverb split index roomLength roomHeight sourceLR sourceFB listLR listFB hpf warmth diffusion`
 
 Run the Early Reflection Reverb from the Invada Studio plugins.
 
-**TODO** Parameters.
+**TODO** Parameter list
+
+## `highpass split index freq gain noClip`
+
+Run the High Pass Filter from the Invada Studio plugins.
+
+Parameters:
+ - `freq`: Frequency. 20-20000, default 1000
+ - `gain`: Gain, 0-12, default 0
+ - `noClip`: Soft Clip (assumed boolean), 0-1, default 0
 
 ## TODO `echo split index delay`