Hello,
First of all, the callouts are pretty good, thanks to the ini team! But... The "2500" callout is not accurate compared to real life. The ini one sound like "2500" but in real life its more like a "2000....500". I put a example here in the topic.

Yeah, ini has gone for a headphones approach which I didn't realise now (so understandable that my topic a while back was locked, I complain a tad bit much about this)
but they've used youtube gpws callouts (insert aircraft here) as reference which isn't entirely accurate, all the vids I've seen have the incorrect tonality
Here's a video where it does appear the audio is hooked up to the audio panel in the aircraft which means ATC audio and RA callouts:
Etihad A350-1000 landing at super busy New York JFK Airport
Airbus A350 - Full Approach and Landing in Boston (ENG subtitles)
^That is a bit more clearer audio, I hear a difference
They did correct the voice with the a340 and the quality was superb, although the last time I requested it unfortunately it turned into youtube low quality audio.. if there's anyway to implement it like the a340 would be great.