Does the PSP support VBR MP3s?

Hey there,
Is there anybody who knows if MP3s, coded as a Variable Bitrate (e.g. a 64kbps-128kbps range), do correctly work on the PSP? Maybe MP3pro support too? Or is there any better Homebrew MP3 Player (in comparison with the official one on the PSP) out?

Thanks for advice :)

P.S.: Which Bitrate(-Range) do YOU prefer for the PSP?