I would be interested to hear your views on the sounds on your own PA1000 and in particular how Eq settings change the overall sound quality.
Sorry to say I have not played with EQ, so I have nothing to contribute there.
I'm lucky enough to have a stable of boards, and the PA1000 is one of a number of boards that has some of my favorite sounds in it. For the sounds I mostly use it for, I can't unequivically say it's better or worse than my Roland, Yamaha, or Kurzweil... all of these are "good enough" and each has some favorites that I prefer over equivalents in another. As good as the sounds are, though, that's not what prompted me to get a PA1000. For me, it was more about filling a functional purpose than a sonic one.
I wanted something lightweight that had good enough speakers that I could easily carry nothing but the one board if I were doing a drumless rehearsal, getting together with a friend to jam/compose, play solo at a party, do a solo/duo wedding ceremony/cocktail hour, etc. As a bonus, its sounds and interface also make it well-suited to be a top-board over an 88 at events where I move from cocktail hour to full-band reception, meaning I could take two boards to that kind of gig instead of three as I sometimes did. It also meets my requirement for having an interface/design that makes it easy to do quick sound changes mid-song. And I liked the tilt-screen, which can make it easier to operate when on a top tier, or in the sun at an outdoor gig. It's not perfect, I wish it had 7x keys and weighed even less, and booted up a bit faster, but it basically fills the bill.
My first attempt at getting a board to fill this purpose resulted in the purchase a a Casio MZ-X500, which I liked quite a bit, I think it's under-appreciated. But the PA1000 was a nice step up in action, quality of sounds, and fullness of speakers (you couldn't really push much low end out of the Casio), plus had aftertouch, so I made the move. It also seems to have better MIDI functionality, which would be useful to me, though I haven't made use of it yet. The Casio gives you a ton of functionality with a nice interface at lower price and lower travel weight, and still has above average speakers, but it's not really in the Korg's league, and while its sounds were quite usable, it probably has no sounds I'd particularly miss, unlike the Korg. Some day, I intend to finally getting around to playing with the PA's arranger features, something I've never done on any board but seems like fun and could open up some other performance capabilities. I also haven't played with its vocal processor functions yet, which also interests me.
I had a PSR S710 and then the 950 with which I've been very happy, but am always open to new ideas. My favorite registrations are Hammond organs, and while both of these are ok, they could be better. I presently use a Roland VK-8M module with my 950 which sounds remarkably good for almost 20 year old technology. It would be nice, however, not to have to use it
One nice feature I only just discovered about the PSR-SX900 is that it has auxilliary assignable outputs. I"m thinking you should be able to use that to send its drawbar organ ("organ flutes") sounds out to a rotary pedal (e.g. Neo Ventilator), to potentially get a much better organ sound without the complication of driving/integrating a whole separate sound source like the VK-8M. Another nice use this feature could be to send your left hand "bass guitar" to its own output, something I like to do if I can send it to a bass amp, or if there's someone doing sound and I want to give them independent fader control over the "bass guitar." Assignable outs is a great feature, that's something else that could improve the PA1000.
ETA: This might also be a nice enhancement to the Yamaha's organ capabilities...
https://easysoundsshop.de/en/yamaha...00/114/psr-sx900/sx700-organ-session-download
