The last thing you need to do is set up a controller movie clip that, each time it cycles through its single frame, will check the value of your gradient variables and manipulate them to add the proper strings to them - and then use setRGB and _alpha to change the color and opacity of each gradient swatch to reflect:
onClipEvent(enterFrame) {
testcolor1="0x"+_root.base.gc1;
testcolor2="0x"+_root.base.gc2;
//make the color boxes display each individual gradient color
gradcol1=new Color(_root.base.gdcolor1);
gradcol1.setRGB(testcolor1);
_root.base.gdcolor1._alpha=_root.base.ga1;
gradcol2=new Color(_root.base.gdcolor2);
gradcol2.setRGB(testcolor2);
_root.base.gdcolor2._alpha=_root.base.ga2;
}