Accordance to http://www.emunewz.net/forum/showthread.php?tid=149045
the voice is a mono MP3.

06:59:370 user_main I[KERNEL]: HLE\sceKernelThread.cpp:2180 sceKernelStartThread(thread=298, argSize=0, argPtr=00000000)
06:59:418 Sound Thread I[ME]: HLE\sceAtrac.cpp:1272 0=sceAtracSetDataAndGetID(08a6c3c0, 00126424)
06:59:418 Sound Thread W[ME]: HLE\sceAtrac.cpp:1162 This is an atrac3+ stereo audio
06:59:419 NowLoading I[KERNEL]: HLE\sceKernelThread.cpp:2299 sceKernelExitDeleteThread(0)
06:59:488 user_main I[IO]: HLE\sceIo.cpp:837 stdout: 071.gim Loaded
06:59:622 user_main I[IO]: HLE\sceIo.cpp:837 stdout: 700.gim Loaded
06:59:654 user_main I[IO]: HLE\sceIo.cpp:837 stdout: 071.gim CountPlus
06:59:687 user_main I[IO]: HLE\sceIo.cpp:837 stdout: 071.gim CountPlus
07:09:431 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:21:643 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:23:646 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:25:564 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:27:516 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:34:206 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 00000000
07:34:573 user_main I[ME]: HLE\sceMp3.cpp:533 sceMp3GetInfoToAddStreamData(09FFF5B8, 08A615C4, 09FFF5DC, 09FFF5D8)
07:34:589 user_main I[KERNEL]: HLE\sceKernelThread.cpp:2180 sceKernelStartThread(thread=280, argSize=4, argPtr=08a621ac)
07:34:611 ThreadCtrl I[KERNEL]: HLE\sceKernelThread.cpp:2273 sceKernelExitThread(0)
07:34:623 user_main I[ME]: HLE\sceMp3.cpp:561 sceMp3NotifyAddStreamData(09FFF5B8, 29232)
07:41:180 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 09fff5b8
07:43:816 user_main E[ME]: HLE\sceMp3.cpp:589 sceMp3ReleaseMp3Handle: bad mp3 handle 09fff5b8
07:44:383 user_main I[ME]: HLE\sceMp3.cpp:533 sceMp3GetInfoToAddStreamData(09FFF5B8, 08A615C4, 09FFF5DC, 09FFF5D8)
07:44:400 user_main I[KERNEL]: HLE\sceKernelThread.cpp:2180 sceKernelStartThread(thread=280, argSize=4, argPtr=08a621ac)
07:44:401 ThreadCtrl I[KERNEL]: HLE\sceKernelThread.cpp:2273 sceKernelExitThread(0)
07:44:433 user_main I[ME]: HLE\sceMp3.cpp:561 sceMp3NotifyAddStreamData(09FFF5B8, 37008)