Orpheo said:
yes and no. if you only use ONE per pickup, you're right. if you use TWO, you get all the 4 tones; p90, rail, series and parallel. just like the triple shot. since you only need one pole of the switch-part, you can switch 2 pickups simultaniously with 2 push p pots to the setting of your liking. so you get BOTH to parallel, or BOTH to p90, etc etc. you can't get neck to p90 and bridge parallel, with only 2 pots, for that, you need 4 pots (or 4 switches, or just 2 triple shot rings).
That still doesn't work. If you get the P-90 or the Rail with one push/pull, what is there to series or parallel with the second push/pull? The push/pull would need a third position (which it doesn't do) for humbucking with the Rail and P-90, then it could be series or parallel with another push/pull. A DPDT with on/on/on would be ideal with the middle position being series. I'd do it all with one switch per pickup instead of two. IMO, 1,000,001 different pickup combos is useless if 999,999 of them aren't useable tones. Those multiple choice switching systems where switch B only works when switch A is engaged, I don't care for.
I'd even go so far as to say the P-90 and humbucking mode would be more desireable than just the Rail by itself. I'd wire a push/pull like that. Series Humbucking and P-90.