Some questions about digital pianos and casio privia px 100

So I wanted to have a digital piano just to have because I want one for midi input, to be a synthesizer, and to have a piano up stairs where my guitar is. But I have some questions:

First, I want to plug it into an amplifier to get a better sound but None of the keyboards I've seen online say "audio out port" does that mean there is no audio out or does that mean that audio out just obviously comes standard with all new keyboards? My Yamaha PSR- some number has an audio out but the casio privia px 100 doesn't say anything about it.

2: I want to mix sounds and have synthesizer work station combing cubase with the casio px 100. I want to be able to download sounds offline and use sounds with cubase through my computer and controll it with the casio and output it through the amplifier. How would I go about doing this? I've recently got interested in synth music.

When you say you're gonna play it trough the computer, then you'll naturally send the sound out the computer anyway? So there is really not much reason for it to have and audio outout, but I guess it does.

But yes, it does have an audio out for headphones meaing you can connect your speakers or amp through this.