In both cases, reducing the pressure from the reg will reduce the velocity (if you have the HP regulators pressure set too high, it can actually lead to a drop in velocity, but within normal parameters, increasing the pressure increases the velocity).
Looking at the bottom of the HP reg, there is a brass disk with a hexagonal hole for an allen key. Turn the disk clockwise to increase pressure, anti-clockwise to reduce pressure.
For the LPR, you need to turn the knob under the barrel. Unlock the two small grub screws before you try and turn the knob. Again, turn the knob clockwise to increase pressure, and anti-clockwise to reduce pressure.
Just as a point of reference, you actually have a third method of adjusting velocity - increasing the dwell value will increase velocity (up to a point) and reducing dwell can decrease velocity.
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Hundred, hundred, hundred bottles on the wall, you wonder if you can drink them all.
Got to go home by 1am, the bottle wins the battle again.
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