Place the butters and oils in the toil of a double boiler or a bowl set over a pot with water. Bring to a medium heat and stir constantly until the butters are melted. Remove from heat and allow to sit to begin to cool. Cover and place in the refrigerator to allow to almost completely cool.The mixture will begin to reharden from the edges. I would take the mixture and with an hand blender or hand mixture 'whip' to begin to blend. Return to refrigerator and repeat this process until mixture fully incorporates. Bring out from the fridge - the cocoa butter will cause this to harden somewhat - allow to soften and whip once agail with stick blender or hand mixer until light and fluffy. Place butter in glass or plastic jar with lid. Keep cool.