I always think of 6/8 time as 2 beats to the bar, each beat being a triplet, but I have noticed the 4 beat too, so I guess they are combining two measures. Don't know why.
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Graham
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150