Sync music over INTERNAL and EXTERNAL memory

[stammers]

Gday

I've got 20gbs of music, a 16gb card and 16gb phone memory.
Anyway of making this happen magically (iTunes like)?
I tried Kies2 (2009 wtf?) and was happy when I saw it had an option to continue to use the external memory when internal is full. However all it did was attempt to copy my music to the internal memory then it ran out of space and attempted to copy the same songs onto external, and funnily enough ran out of space again.

Apparently DoubleTwist now supports internal memory, but will it do what I want?
Would also be nice if it actually copied half the artist names unlike Kies (must be something to do with the tags)...

Many thanks

[stammers]

Anyone?

I've attempted using DoubleTwist and created 2 playlists, with Artists from A-L and L-Z. I have then set it up to sync A-L to internal memory and L-Z to external memory.

However DoubleTwist appears to be very slow and very buggy. Half the time it refuses to recognise the memory card or will crash before copying all the songs across.

I guess I could manually copy the songs in the first place and then use the sync feature when changing songs.

Any suggestions would be appreaciated!