[quote name='martin8708' timestamp='1411751970' post='2562564']
Practice , practice and even more practice .
[/quote]
Exactly. I found it hard doing BVs after 10 years of just playing bass. Now it's pretty much second nature to me, and I pick up new parts really fast. It's a useful skill to have. Keep at it, and practise whenever you can, it will become easier with time and repetition.
I used to break down the two parts to find out the order of bass notes, consonants,or both sounding together. Does that make sense? Then get practising, slowly at first. Once you get the hang of it take the tempo up, gradually.
Something I got told a long time ago - 'you don't practise 'till you get something right, you practise till you never get it wrong!'