I've been tested Boeffla Sound Control but the Headphone Analog gain is limited 45 to 63 db(if you're not over 45 dB analog gain can't go down) . For best quality on Headphones, Casques or Amp, analog dB must be below 45 dB. With my modification this appli work correctly(according to Voodoo Sound hack). No more crackles, better SNR, less background noise.
Boeffla Sound 1.7.1 modified by Matyas69.apk