I have finally decided to purchase a Carvin 6 string fretless. The only problem is that there is no way for me to try one out since you have to order them. I am curious about how they sound. There are a few different pickup options and I want to make sure I make the right choice before I get one. The first option is single coil jazz pickups. The second choice is stacked humbuckers that fit in a single coil jazz spacing in a jazz configuration. The third choice is a jazz pickup in the neck position and a big stingray style humbucker in the bridge position. I was wondering if anyone owns a Carvin and can explain the tonal characteristics of each configuration that they have tried. Do the stacked jazz humbuckers sound any different than the singles other than hum cancellation? To give you an idea of what sound I am looking for, I like to play aggressively with my fingers and pull hard at the strings to give the notes that percussive "slap" sound. I prefer flat wound strings on a fretless even though they produce a darker tone. To compensate, I like punchy, bright pickups. So if anyone can tell me which pickups would be most suitable for my style, I would greatly appreciate it. Thanks.