Hello Barend,

I think you're already trying this, but you might want to use this approach to finding that tone:
- Start with both filters wide open, both Q-switches at max.
- Solo the treble (bridge) pickup.
- While playing, turn down the treble pickup filter until the you get as close as you can to the desired "nasal" timbre.
- Now, bring the bass (neck) pickup into the mix to add its sound (clean lows/mids with the crisp top).
- Play with the mix to balance the treble and bass pickups to taste. Try reducing the treble pickup Q if it sounds too "peaky". You gotta have some though, or things will behave more like a typical tone control.

I don't think this will work quite as well on a Spoiler, since the filter works on both pickups together. Also, I agree that the string choice might not impact the "nasal" part of the sound much; however, It always sounds to me like Stanley still gets some "zing" at the same time, and string choice will contribute to that. As previously mentioned, Stanley uses stainless steel roundwounds, typically light gauge Rotosounds. And, It might be a good idea to keep your overall EQ as flat as possible when tone shaping, to ensure that the EQ curve doesn't work against the sound you're striving for.

I tried this a bit on a Series II and a bass with Anniversary electronics (non-Fatboy AXYs). Yeah, the SII gave me more of everything, but the other bass was no slouch either! It just seemed like it was easier to find a sweet spot on the SII. I can't say that I nailed that tone, but I feel like I got close, and I didn't spend that much time knob-fiddling.

As others have said, have fun! You may find some new things along the way.