Auris park assist beep rear too low in volume

[tracs]

Yesterday I went to the toyota dealer with my 2015 Auris Hybrid Station and removed the beep when gear is in reverse.

The beep is now gone but I noticed the beep from parkassist is reaaallly low now from the rear.  The front still has the same volume.

I called my dealer to ask if this was because of the change regarding the reverse beep and they said it wasn't the case as it's a fixed volume.

I could have sworn this park assist beep was louder  before the change. Now I am not sure what to do. Could removing of the reverse beep have affected the volume of the park assist rear beep?

 

[Devon Aygo]

There are two parking sensor setups, factory & accessory:

Factory sensors are flush un the bumpers and display on the media display, settings for these can be adjusted via the media screen by pressing setup > vehicle here the volume & range can be altered 

Accessory are not flush and only give an audible warning these cannot be adjusted except by relocating the sounder closer to the driver.