Nah. Sorry. I assumed that everyone did their IK chaining the same way, i.e. accuators housed within the armature so their are setable with Action keys. Here’s how I build one:
Point of origin - bone 1 (hip) - extend bone2 (up) - extend bone3 (mid) - extend bone 4 (low - this is the last actual bone to be used for deformation) - extend bone 5 (toe - this bone is only a “holder”, as the IK will work from the root of the last bone, not the tip) - stop - select the root of bone 5 (toe) and snap the cursor there - add a new bone to this same armature, bone 6 (Leg.acc).
Leg.acc should have the exact same root position as the root of bone 5 (toe) and the tip of bone 4 (low). You then enter pose mode, select bone 5 (toe), add an IK Solver constraint to it, Object: Armature; Target: Leg.acc.
The advantage to putting the control objects inside the deformation armature is that you can key the thing as a whole, allowing you to save the full motion as an action and make use of it easily in NLA.
If this description doesn’t suit, you can always download and examine the .blend file.