i have a friend who bought an emg 81 and a dimarzio air norton for his ibanez rg220b. a while ago somebody told me that to get only one emg, you need to have seperate volume knobs or something on the guitar. i dont know if this is true or not. but my question is if he just bought those two pickups for that specific guitar, would they work? or would he need to buy something else. i apologize if this was asked like 20 years ago or something. thanks for answering in advance.