Locked out distributor...

dirty white boy said

These MSD Start and Step timing controls are designed to provide an adjustable start retard to help high-compression engines crank over easily. Plus, they use a single-stage retard. They simply connect between the distributor and the MSD ignition. The MSD Start and Step timing controls feature two separate rotary dials for quick, easy adjustments. They require the use of MSD's ignition control.

MSD Start and Step Timing Controls 8987

advance is controlled by required msd ignition control, if dizzy advancing and retarding mechanically and by msd, spect it run all sorts of funny!!

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If I don't lock out this distributor I don't need the start retard side I can just put that on 0... it says just hooking up this controller will instantly retard the timing four degrees.. as I understand it the first time I start the car with this new box connected I will have to go out in advance the timing four degrees.. also as I understand it when I put 12 volts to the activation wire at any time it will pull the amount of timing out that I set it for...
likely this scenario won't play out till I'm at full timing anyways but I was just wondering if anybody knew how it scaled or if it did?
As in if I'm at 19 initial and 33 all In and I had it set at let's say 6 degrees if I initiated it at idle with it drop down to 13 degrees and if I kept it initiated would it just go up to 27 and back up and down?...
Or if I activated it in the middle of the curve would it just dropped 6 degrees and hold it up and down the scale or would it just lock it out six degrees wherever I'm at and hold it there?..