It’s not Apex, they reduced the sound from Gen 3 or 3.1 I guess, cause my 3.1 also has so low sounds compared to my Series 1. There are many comments about this on the forum.
Also the horn,
I asked this last year in the QnA
Here is what they said,
They could have added ‘Series 1’ on the new UI like they wrote ‘APEX’ there. Also I feel, the bootup sound of the OG 450 was much better than Gen 2/3.