Congratulations.

They will work, but you’ll need to experiment a lot to dial in exactly the right settings with some of them.

The most straightforward one will be the Attack-Decay. It’s a triggered effect which is actually good when you use it with an organ because it will provide a consistent trigger.

The Superego Plus is a great pedal, but it’s a bit of a mismatch for an organ. Guitar players like it because they can sustain notes forever, but an organ can already do that. I’m not saying it’s not useful at all with an organ. The built-in effects are very good and they can be used without the freeze feature. Using the freeze with an organ allows you to apply some effects to the frozen signal and another set off effects to the live signal.

The Key9, Mel9, C9, and B9 will all work, but I don’t know why you would use the B9 which is a B9 emulator for guitar when you already have an excellent, and frankly superior, B9 emulator in your Nord. The B9 also lets you emulate some other classic rock organs, but you can load sound libraries into your Nord. I don’t know all of the sound libraries that are available for your Nord, but it seems to me the only one of the “9” series pedals that you might find useful would be the Synth9 which is the one you don’t mention. That one emulates lots of classic synths which I don’t think is Nord’s specialty.

Whichever of those you use, you have to make sure NOT to use the tone wheels (pulls, stops, bars, etc.) and reduce the click simulation. The 9 series works best with a clean, simple signal as close to a sine wave as possible. Complex harmonics can throw them off, and you want to put your 9 series pedals as close to the beginning of the signal chain as possible.

If you want to do ambient music you should consider a good reverb like the Oceans 11 with a good delay like the Canyon or the Grand Canyon delay. You should also consider modulation effects like an Electric Mistress (flanger), Small Stone (Phase Shifter), Good Vibes (Univibe Phaser), and Stereo Pulsar (Tremolo).

The Oceans 11 reverb and Canyon delay are very modern “time based” effects that include settings that are very populare with ambient musicians like “shimmer” and octave which are used to create those “etherial” “heavenly” “hypnotic” types of sounds.

Phase shifters, flangers, and Univibes (really a special type of phase shifter) are classic effect that were heavily used by psychedelic bands to creat a “swirling” “spinning” or “pulsating” sound similar to a Leslie speaker. EHX makes a Leslie simulator, the Lester, but the Nord already has a Leslie simulator in it. These effects are different from a Leslie and have their own unique sounds. Since ambient is what you’re going for I would recommend the Bad Stone over the Small Stone because it has a more pronounced filter. I would recommend the Deluxe Electric Mistress because it has more control over the range and the “color” than the Neo Mistress and it has stereo outs. If you can only do one thing, I would recommend the Good Vibes because it has the deepest, most lush, most hypnotic throbbing of the phase shifters and it also does a very nice true vibrato.

If money is no object, here is my recommendation for a fantastic ambient setup:

Nord -> Attack Decay -> Mod Rex Polyrhythmic Modulator (Phaser, Flanger, Tremolo, Vibrato) -> Good Vibes -> Grand Canyon Delay -> Oceans 11 Reverb -> Amp or Board