add foverdrive cmd

- lang: remove oldGetCommand

doc/README.md

@@ -23,7 +23,8 @@ where in the file you want the plugin to be ran.
 so, if you did `plugin 3 1...`, it would split the file in 3, then get the
 part that is of index 1 (starting at 0).
 
-**Keep in mind parts start from the bottom of the file.**
+**Keep in mind parts can start from either top or bottom of the image,
+it depends of the file format**
 
 ## `load path_or_arg`
 
@@ -259,7 +260,7 @@ other presets:
  - gain\_max (dB): -20..40
  - rms (signal level, dB): -80..10
  
-## `thruzero split index 
+## `thruzero split index rate mix feedback depth_mod`
 
 > Tape flanger and ADT
 
@@ -269,3 +270,9 @@ other presets:
  - mix (wet/dry mix, set to 50% for complete cancelling): 0..1, default 0.47
  - feedback (add positive or negative feedback for harsher or "ringing" sound): 0..1, default 0.3
  - depth_mod (modulation depth, set to less than 100% to limit build up of low frequencies with feedback): 0..1, default 1
+
+## `foverdrive split index drive`
+
+Fast Overdrive from SWH plugins.
+
+ - drive: 1..3, default 1