Voodoo Audio Measurements Player app: Author: François SIMOND aka @supercurio http://twitter.com/supercurio Available on Google Play, https://play.google.com/store/apps/details?id=org.projectvoodoo.audiomeasurementsplayer Source code license: Probably GPL (contaminated by jFlac LGPL source code) jFlac: http://jflac.sourceforge.net/ Strict methodology and measurements are the key.