Sound stuttering in PAL mode
 

I live in the UK, and am running a backed up NTSC game on my PS2.

when going through Swop Magic, If I set it to NTSC, it'll play cutscenes fine, but everything is in black & white.
However, on PAL, it's in colour (although the screen is offset, but that can be corrected) - but annoyingly cutscenes have stuttery sound.
Is this because of my TV or audio? It works alright on Normal/NTSC mode, but as I said, it's always black & white

can anyone help me out?

Thanks :)