DVDR3370H poor sound - help!

hello

i bought the product in oct 2006 in dubai and am now back in the UK, using it with a tv (jvc), also from dubai.
have connected to the sky + box and it records ok in terms of picture quality but sound is either non existant or very very low.
am using red white and yellow leads as connectors. no scart sockets on either product. hdmi on tv only, have got the componet ones on both - would new leads help?

please help i need these programmes i have recorded

if you can help - please give basic, step by step help!

thank you!!