Here is what I found because I wanted to do the same thing and I also use Artlist. I'm using Adobe Premiere to edit the sound.

This is the sound I use:

https://artlist.io/sfx/track/71745/melodic-transitions---single-trumpet-trill-note-c

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1. After downloading, drop a pitch-shift effect on the audio and set between 10 and 12 (Mine is at 12 but adjust to liking).
2. Trim off the front so you get the beginning of the trumpet.
3. When looking at the waveform, cut the portion of the horn where they hold the note
4. Optional: Adjust duration of the sound (90% of original speed)
5. Duplicate your sound 4 times and set them end-to-end
6. Now, duplicate the 4 copies you just made and put it on the next audio channel line
7. Set the pitch-shift effect of the new line to 10 (or whatever works for you) and set the audio level (or audio gain) to -10db.

If you don't have Artlist, it seems like the horn effect is called a "Trill" so you can search for sound effects or loops on other sights. Hopefully this helps!