I watched both videos, and I was left 'un'-impressed.
The fellow needs to calm down and not talk so briskly. He also ought to sweep a search coil in a more 'normal' sweep-speed fashion and not so briskly. Also, he needs to know his detector and settings before he makes a video. He says it has Iron Audio adjustment and then he adjusts is the Iron Volume level. That's different.
Also, he kept using the ZERO mode and said he turned 'On 'Iron Audio, but that was also wrong. The Garrett Apex, like some other Garrett models, has an Iron Audio feature or function, but it does not work when in the ZERO mode. It works when there is some rejection or Discrimination used, such as if in the Jewelry or Relic mode where the Iron range is mostly rejected.
If in the ZERO mode without any rejection in play, then you already HEAR the Iron Audio tone range and can adjust the Volume level of that. The Iron Audio push-button simply selects a momentary Iron Audio response to potential problem iron when it is being rejected.
Using that button-activated feature in the ZERO mode doesn't assign it an Iron Audio response, but instead produces an errant higher-tone response out of the ferrous-range. Therefore people hear a better-sounding audio tone and think the detector has some magic, deep-seeking ability when using the ZERO mode. Wrong.
So to be a better video, it should show likely performance as if the detector encountered a target using a normal sweep speed, and do it with the proper settings, not an improper selection.
I've watched over a half-dozen videos since the Apex release where the video maker didn't know the proper function of the settings used, and that gives incorrect information. And for the record, I own and use over a dozen detectors and the Apex is handling a lot of typical iron trash encounters quite well, and it also has good separation abilities compared with other detectors using a similar size and type search coil.
Monte