What i think is u can connect the two tamas
Also by my research of my music star and v5
When u connect the two, u press the button for v5
before u do that, u press marry when both tamas are old enough to marry
(to check, see if a guitaritchi brings a mate on music star and on v5 go to dating show to check)
Also make sure ur v5 has more than one character on it so u can send a tamagotchi to ur MS, only
if u press give.
i dont think its vice versa because u only have one tama on MS.
or another theory is that once u press recieve on the v5, the tama on Ms will
go to v5 and stay there while the new baby is sent to ur Music Star.but im not sure!
I never tried
hope zis helps!