Guys, I'm so scared of Anti-Aliasing, or rather, the lack of it

[Bunny_boy]

the only thing to fear, is fear itself.
and death from above.

That's because they're rubbish

[I_Am_Become_KVR]

I like to sprinkle aliasing on my breakfast cereal. Has a nice zest to it.

[BertKoor]

Here's a sine sweep I generated, it goes all the way up to 95kHz in a 192kHz sample rate WAV file. The program I used here (think it was Ocenaudio) doesn't do log sweeps, only linear, so I've made it in linear segments of an octave.
https://www.bertkoor.nl/sweep_192kHz.wav
The spectrum view is Ocenaudio for sure. It used to be Mac only, now also Windows (and portable) & Linux.

Screenshot 2025-02-25 at 08.37.42.png

Used the trusty Audacity to convert the sampling rate back to 44.1 kHz. Clean cutoff, no trace of aliasing:

Screenshot 2025-02-25 at 08.42.03.png

Ocenaudio should be able to do that as well. You'll see a tiny bit of aliasing folding down. Frequency is so high, only dogs can tell.

Screenshot 2025-02-25 at 08.44.18.png

Then I created a fresh project in Reaper. Dragged & dropped the sine sweep on it, and exported it to a 44.1kHz wav.

Screenshot 2025-02-25 at 08.45.58.png

Same procedure in Tracktion Waveform:

Screenshot 2025-02-25 at 08.47.24.png

Draw your own conclusions...
This is easy to execute as I showed you, and you now know what to look for.

Live long and prosper.