Practicing speed is useless if the basic sound coming out of your instrument is like rubber bands or nails dropping into a bucket.
(Practicing speed; is; useless) (the basic sound; coming; out of your instrument) (the basic sound coming out of your instrument; is; like rubber bands or nails) (rubber bands or nails; dropping; into a bucket)
Practicing speed the basic sound the basic sound coming out of your instrument rubber bands or nails
is coming is dropping
useless
out of your instrument
like rubber bands or nails
into a bucket