Great info here y’all! It’s giving me a lot to thing about. Thank you
@DJmtd for the clarification, as well as everyone else!
@sunbeast, also thanks for that info! That pickup sounds legendary. I agree, why don’t more people use this???
Damn, its discontinued
Roland has moved in the last couple years to the GK-5, which is basically the same passive pickup part as the GK-3 but with an AD convertor in the pickup so that you can use a (unfortunately proprietary and expensive!) TRS data cable rather than the old 13-pin analog cable used on the GK-2 and GK-3. You still get the individual output per pickup to play with inside the pedal processors, just with a theoretically more reliable cable system (the 13-pin cables and connections could definitely grow unreliable due to age and/or corrosion/oxidation over time and would have an inherently higher noise-floor than a digital signal like this which could affect tracking).
Along with that they have made a few outboard pedals compatible directly with this new pickup- the Boss GM-800 (essentially the synth engine for some of the flagship Roland synthesizers in pedal form and with guitar/bass pitch-conversion and MIDI out) and the Boss VG-800 (a guitar modeling unit using the same low-latency sound manipulation and effects as the SY-1000). Unfortunately the new pedals aren't directly compatible with the old pickups and the new pickup isn't directly compatible with the older units, but they made two different conversion boxes so you can use old pickups with new pedals and new pickups with old pedals. It is all kinda $$$$ right now, but it means you can find some of the older pieces for cheaper occasionally as people "upgrade".
I want to try the GM-800 eventually, but waiting for used prices to drop. I'll probably stick with the old pickup system since I already have several compatible and just get a conversion box. In typical Roland fashion, the new units lack some of the features of older units and bring their own issues and limitations- a big issue with the GM800 is that you get this really powerful synth/digital keyboard engine (with lots of sampled instrument sounds alongside synth sounds), but to get full editing capabilities to build your own patches you have to pay for a subscription to unlock the computer editor (you get some light editing on the pedal, but not alot for a synth). Personally I hate the concept of subscription anything in the creative world, which is why I haven't dropped the money for the GM yet despite loving the sounds I've heard and the general feature-set. The VG800 lacks alot of the sounds and tweakabilty of the SY-1000 or the older Roland VG/VB-99 as well, and you can't stack as many layers- it seems like the SY-1000 might have that one beat for my uses.