Hi,
i have the same and still have the RADIO AUDIO pb become mute as soon as i start igo_world or igo_gift or igo_basar- work only without any pb with igo_nextgen ext sd
i am working with android 4.4.4
external sd0


please find below what i have in my sys.txt
[android]
fullscreen=0
show_status_bar=1
has_physical_home_button=1
background_shutdown_timeout=0
check_folders_after_rebuild=0
disable_restart_after_phone_call=1
create_sdcard_dir=0
close_keyboard_on_back=1
background_navigation_enabled=1
getdeviceid_trycount=0
navigation_audio_stream=4
;STREAM_VOICE_CALL - Value: 0
;STREAM_SYSTEM - Value: 1
;STREAM_RING - Value: 2
;STREAM_MUSIC - Value: 3
;STREAM_ALARM - Value: 4
;STREAM_NOTIFICATION - Value: 5
;STREAM_BLUETOOTH - Value: 6
;STREAM_DTMF - Value: 8

br