Since we have this as a FYI post..
if you put a line to just the SIDE port of the external gates, it will act like a single port actuator, like your factor actuator.
If you have a direct line from a boost source to the side port of the external, with NO solenoid or bleeder, it will give you BASE boost, or spring pressure.
Most all external gates have an adjustment screw on the top. This will adjust your base boost, in both single port and dual port mode.
To give you a better understanding of the dual port setup, if you have a regulator, as shown in the picture, and you CLOSE the regulator, the boost level will be your base boost, like you are just putting a direct line from boost to the side port. If you have the regulator completely OPEN, you will have max boost available, ie wastegate won't open to vent. Somewhere in between, via adjusting your regulator, is where you will find boost control. So start out with the regulator closed, and start testing, a turn or half turn at a time.
if you are using mechanical control (regulator/bleeder) you will want to run as high a base boost spring as possible, otherwise you may have the wastegate opening up early. For example, if you are going to run pump gas, 15psi, at the lowest setting, you'd want to run a 13-15psi base spring rather than a 4psi base spring. This will give you a higher range of boost control as well.
if you use an expensive, trick dual solenoid electronic boost controller, you *can* get by with a lower base boost spring, for maybe setting launch boost etc. The reason being is that the electronic control (IF it is a good one, ie Innovative etc) will put full boost to the top port to keep the wastegate forced shut for as long as possible for spool up, and is quick to respond to changing boost levels. Mike used this configuration on his truck, and had a switch to jump to high boost mode, kinda like hitting a nitrous switch. Great for street racing

Endless possibilities here- have a boost level set for launch boost, with switch set from the brake, have a switch setup to drop boost level if you hear knock, or see it with a gauge/scan tool.