sorry for my english.pifba have a problem with some games do not have sound, but with the retroarch fba works with sound. fba of retroarch is very slow. Is there any way to make it faster? this is my configuration :

<system>
<fullname>Final Burn Alpha</fullname>
<name>fba</name>
<path>~/RetroPie/roms/fba</path>
<extension>.zip .ZIP .fba .FBA</extension>

<command>/opt/retropie/supplementary/runcommand/runcommand.sh 1 “/opt/retropie/emulators/RetroArch/installdir/bin/retroarch -L /opt/retropie/emulatorcores/fba-libretro/svn-current/trunk/fb_alpha_libretro.so –config /opt/retropie/configs/all/retroarch.cfg –appendconfig /opt/retropie/configs/fba/retroarch.cfg %ROM%”</command> –>
<platform>arcade</platform>
<theme></theme>

and this is my overclock :

arm_freq=900
core_freq=300
sdram_freq=500
over_voltage=2
avoid_safe_mode=1
gpu_mem=384
overscan=1

any solution ?thanks