I sometimes us BV multiball. It needs an other thinking, as using one ball methods use to not work well.
I play numbers, dozen and cols, all other bets looks not so useful in multiball.
When playing doz or col I use to pick one and stay there and try to win 10 units. I have seen that it is not good to play more than on doz or col. Do not use three balls I use always two.
I use one up on loss (None the both numbers is not in my selected bet) and go down one unit (if more than one) on win if it is one hit or double hit. This has been working well.
This play I used 1 Euro (Note a yellow chip here) Got 10.5 Euro.
Todays multiball. Went to 7 in progression.
10 Euro plus.