2017-05-26, 20:12
So it was a tagging issue, I win the bet with myself 
Kodi supports a variety of music file and tag formats, and replay gain in most of them (inc APEv2), I just gave ID3 v2.4 as an example. See http://kodi.wiki/view/Music_tagging#Tags_Kodi_reads. Mixing tag formats within a file is not so smart, stick to one format, if you have both APE and ID3 tags the you need to tell Kodi to look at the APE ones as well, so better just not to mix.
Sounds like MP3Gain is not going to add tags for you nicely so use something else.
I don't know if ID3 v2.3 supports replay gain, I suspect not (but someone correct me).
Consistent and comprehensive tagging is good for the soul
But pick a rainy day (today being the best summer's day so far this year).
Kodi supports a variety of music file and tag formats, and replay gain in most of them (inc APEv2), I just gave ID3 v2.4 as an example. See http://kodi.wiki/view/Music_tagging#Tags_Kodi_reads. Mixing tag formats within a file is not so smart, stick to one format, if you have both APE and ID3 tags the you need to tell Kodi to look at the APE ones as well, so better just not to mix.
Sounds like MP3Gain is not going to add tags for you nicely so use something else.
I don't know if ID3 v2.3 supports replay gain, I suspect not (but someone correct me).
Consistent and comprehensive tagging is good for the soul
But pick a rainy day (today being the best summer's day so far this year).
