Tell him his tone is pretty cool, but that Machine Head tracked with a 5150 because its dynamic phase response and harmonic saturation works better because the magnetic fields might interfere with the Spider's natural compression, and using the Radio Shack microphone might cause a zero potency instability and overload the AD-converter's second gain stage, and the resulting impedance mismatch would lead to a situation where you are forced to smack the musician's head repeatedly with the Spider's floorboard until the ground loop issue is solved and he painfully bleeds to death.