Whats written below is a misunderstanding! The percentage doesn't show relation to original tempo. It shows the swing, i.e. the relation of the number of ticks of even steps divided with the number of ticks for playing two steps. 66% comes from 6/(6+3). Recalculating tempo should be done by multiplying with (6+3)/(6+6) = 9/12 = 3/4 = 75% . /Johan

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The groove of base is

 0 6 50%
 1 6
 2 -

if you want to create a groove twice slower (200% lenght) you needed to put

 0 c
 1 -
 2 -

if you want to create a groove twice faster (50% lenght) you needed to put

 0 3
 1 -
 2 -

if you want to create a groove twice faster (25% lenght) you needed to put

 0 2 66%
 1 1
 2 -

/Guillaume