My P-Bass has the 'S-1' series/parallel switch. I emailed Carey, and he's going to custom make an NP4 for me that'll allow the series/parallel switching at no extra charge ! I'm going to order the pickup through Jay @ Blueberry Hill Bass. I'm sure it'll take some time, but there's no rush on my end, and I'm confident it'll be well worth the wait. I'll keep you posted. Working with indie builders like Carey Nordstrand and Jack Read have been great.