ReplayGain analysis produces lower gain (softer volume) than before

[2nd.Identity]

Hi all, have been using AIMP for as long as I can remember and have been delaying its update for sometime (almost a year perhaps). Recently, after updating it, the ReplayGain analysis seems to produce gains with lower target volume than before updating:
1) I first notice it when playing albums analysed before updating and after updating in the same playlist. The difference in volume is very noticeable - albums analysed before updating played louder than those analysed after updating.
2) To be sure, I reanalysed a few albums which were analysed before updating and the new gains are indeed lower now - I am expecting it to be the same (or close) to the previously analysed values.

Before I reanalyse my library, may any kind souls enlighten me whether:
a) Are there settings which I may have missed or that the update may have reset which lead to this behaviour? or
b) Is there a change in the ReplayGain analysis algorithm and I have no choice but to reanalyse my library?

Thank you!

[Artem]

What version of player you have used before an update? What is your version? Mobile or Desktop?

[2nd.Identity]

Hi Artem, I am using both the Desktop and Mobile versions - Desktop - to analyse and listen; Mobile - to listen.
However, I am sorry I could not pinpoint exactly which version was it before updating.
A quick check on the program files on my computer, there were files as old as July 2019, perhaps it was version 4.6x before updating? Hope it helps.

[2nd.Identity]

Just tried installing AIMP v4.60.2180 and AIMP v4.51.2084 (both installed as portable) to try out the analysis:
1) AIMP v4.51.2084 - Produces same gain values as the values analysed before update
2) AIMP v4.60.2180 - Produces same gain values as the values analysed after update.

So, my guess, the culprit is AIMP v4.60, build 2153 where the changelog mentions "Sound Engine: replaygain - analysis quality has been improved". If so, I may have no choice but to reanalyse my library then.