the operator can see which channel is affected, press the appropriate button and go to the b leg. i love it when i come home from work or even shopping and my dogs are at the door with their tails wagging and barking like they are really happy to see me. i need to dig out the fabric again and determine if i have enough to do both. 10720-10750 will be the resistance zone so don’t take any risk. and if you just can't stomach the idea of chugging down all that plain water, spice it up a bit with these ideas! 