diff --git a/README.md b/README.md
index cb159fd..9daff4f 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,51 @@ features
 -tempo change with pitch preserving
 -pitch change
 
+example usages
 
-usages
+help and version
+./ffx.sh --help
+./ffx.sh --version
+
+bass and treble
+./ffx.sh bass song.mp3 25 bass-song.mp3
+./ffx.sh treble song.mp3 20 bright-song.mp3
+
+volume
+./ffx.sh volume song.mp3 -6 quieter-song.mp3
+./ffx.sh volume song.mp3 3 louder-song.mp3
+
+distortion
+./ffx.sh distort guitar.wav 5 distorted-guitar.wav
+
+trim audio
+./ffx.sh trim song.mp3 10 30 clip.mp3
+./ffx.sh trim podcast.mp3 30 no-intro.mp3
+
+tempo with pitch preservation
+./ffx.sh tempo lecture.mp3 1.5 fast-lecture.mp3
+./ffx.sh tempo song.mp3 0.75 slower-song.mp3
+
+pitch with duration preservation
+./ffx.sh pitch vocal.wav 3 higher-vocal.wav
+./ffx.sh pitch vocal.wav -5 lower-vocal.wav
+
+convert while editing
+./ffx.sh volume input.wav -3 output.mp3
+
+automatic output filename
+./ffx.sh bass song.mp3 30
+
+---
+
+extra
+
+---
+
+install helper commands
+./ffx.sh --add-helper-cmd
+
+command helper usages
   ffbass   INPUT PERCENT [FINE_DB] [OUTPUT]
   fftreble INPUT PERCENT [FINE_DB] [OUTPUT]