Sean's short'n sweet manual actually warns you to go easy on those dials when firing up this pedal and he means it. In these days of the low gain ODs and subtle boosters that are all the rage, this pedal kicks some serious @ss! Just got it this morning and I'm letting the old vibrolux cool down for a minute to post this question about the extra chip I found in the box. No markings of any kind on it, but the other guitarist in my band has offered to pop out the the one that's in there now and replace it with the spare at rehearsal tonight. What's the difference between these two chips? Can anyone tell me what kind of change in gain/tone I can expect by changing it? Anyway, this is one fire-breathin box that actually cleans up real nice when you roll back the tone and gain pots. I'll post again after I've had a chance to turn up the amp tonight & try the other chip as well.