This is interesting because i spent at least 3 years slapping in the 'non traditional' way a'la Flea. It took me a long time to
accept and
understand why this method would not work out in the long run. To fully understand the
impact you're trying to make with the slap sound, it's dynamics that comes first into the picture. Imagine slapping the non-traditional way with dynamics; you're using your
whole palm to control the dynamics; at
fast tempos, you have no
choice but to use your whole hand. When i checked out Marcus, i realised that this guy was getting is fluidity on slap because of his thumb action; instead of
moving his whole hand, he only moves his
wrist and more specifically, his thumb.
This is not a hard and fast rule. There are multiple opinions about this but look at it this way- if you want to exploit the slap technique to involve
dynamics and
eveness, thumb action is definitely the way to go; however if you're looking at creating a 'slap sound' without 'dynamics' or 'eveness', the hand over strings method works (it worked for me for quite a few years) because you're projecting a whole sound that's meant to be heard as a 'whole' sound and not anything else. An analogy would be a paintbrush- use a fat brush tip,
cover more area at a point in time but lose out on
detail....if this doesn't make sense, I apologize for not being clear enough; I'm sure there're others on this forum with clearer views; it'll take some time to get used to the perpendicular action but believe me, it's going to become a standard by way of which eveness will be judged. If I'm wrong...well, there's more practicing to do, right!
FunKKing puts it best as well! Cheers!
