What I did with the ones I've built is to add a Range pot and a Shift pot, which the LWA Endless Blockade has. Both pots are B10K, the Range pot replaces R7. Lug 2 goes to C7 and Lug 1 goes to C8. The Shift pot replaces R10. Lug 2 goes to R8 and Lug 3 of the Threshold pot, Lug 1 goes Leg 3...