RPG Maker VX Ace - Text Sound Effect

#==============================================================================
# Text Sound Effect
#------------------------------------------------------------------------------
# by Zerbu
#==============================================================================
module Text_Sound_Effect

  #--------------------------------------------------------------------------
  # Options
  #--------------------------------------------------------------------------
  # The sound effect to play
  MESSAGE_SOUND = RPG::SE.new("Knock", 70, 80)

  # The number of characters to display before each time the sound plays
  # The default is 3, it's recommended you keep it as this unless you
  # know what you're doing
  MESSAGE_SOUND_FRAMES = 3
end

class Window_Base < Window
  include Text_Sound_Effect
  #--------------------------------------------------------------------------
  # alias method: process_characer
  #--------------------------------------------------------------------------
  alias textsound_process_character_normal process_character
  def process_character(c, text, pos)
    #---
    if !defined?(@sound_frames)
      @sound_frames = 0
    end
    #---
    if @sound_frames == 0
      MESSAGE_SOUND.play
    end
    #---
    @sound_frames+=1
    #---
    if @sound_frames == MESSAGE_SOUND_FRAMES
      @sound_frames = 0
    end
    #---
    textsound_process_character_normal(c, text, pos)
    #---
  end
  #---
end