Alsa 432 Hz pitch shift guide

alsa-432-pitch-shift-guide.md

Alsa 432 Hz Pitch Shift Guide

• Install

  sudo apt-get install ladspa-sdk tap-plugins
  

• Find hardware ID

  aplay -L
  wget -P ~/Downloads http://www.kozco.com/tech/piano2.wav
  aplay -D hw:0,0 ~/Downloads/piano2.wav
  aplay -D hw:1,0 ~/Downloads/piano2.wav
  

• Load in /etc/pulse/default.pa

  load-module module-alsa-sink device=hw:1,0
  

• Remove

  ### Automatically load driver modules depending on the hardware available
  .ifexists module-udev-detect.so
  load-module module-udev-detect
  .else
  ### Use the static hardware detection module (for systems that lack udev support)
  load-module module-detect
  .endif
  

• Add

  .ifexists module-ladspa-sink.so
  .nofail
  load-module module-ladspa-sink sink_name=ladspa_out master=alsa_output.hw_1_0 plugin=tap_pitch label=tap_pitch control=-0.3176665363342928,0,-90,0
  .fail
  .endif
  

Calculator: http://www.sengpielaudio.com/calculator-centsratio.htm

Credit: http://www.orangepi.org/orangepibbsen/forum.php?mod=viewthread&tid=2629