anchor.diff:  
   ALLOW_EMPTY_${PN}-meta = "1"
   RRECOMMENDS_${PN}-meta = " \
  +    ${PN}-avl-drumkits \
       ${PN}-linuxaudio-org \
       ${PN}-freepats-zenvoid-org \
       ${PN}-philscomputerlab-com \
  
positive.code: 
  SRC_URI = " \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/airfont_a340u.tar.7z;subdir=linuxaudio.org;name=airfont \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/AVL-Drumkits-1.1-fix-SF2.zip;subdir=linuxaudio.org;name=avl-drumkits \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/fluidr3.tar.7z;subdir=linuxaudio.org;name=fluidr3 \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/fluidr3-splitted/fluidr3gm_bass.sf2.tar.7z;subdir=linuxaudio.org;name=fluidr3gm-bass \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/fluidr3-splitted/fluidr3gm_brass.sf2.tar.7z;subdir=linuxaudio.org;name=fluidr3gm-brass \
  
negative.code:     http://download.linuxaudio.org/musical-instrument-libraries/sf2/melloflute.tar.7z;subdir=linuxaudio.org;name=melloflute \
      http://download.linuxaudio.org/musical-instrument-libraries/sf2/melloreed.tar.7z;subdir=linuxaudio.org;name=melloreed \
      \
      http://bandshed.net/sounds/sf2/AVL-Drumkits-1.1-fix-SF2.zip;subdir=avl-drumkits;name=avl-drumkits \
      \
      http://freepats.zenvoid.org/sf2/acoustic_grand_piano_ydp_20080910.txt;subdir=freepats.zenvoid.org;name=acoustic_grand_piano_ydp_license \
      http://freepats.zenvoid.org/sf2/acoustic_grand_piano_ydp_20080910.sf2;subdir=freepats.zenvoid.org;name=acoustic_grand_piano_ydp_sf2 \
      \
  