Well, _if_ there will be future firmware. Let’s hope.
For me replaygain works Ok - that is, if there is id3v1 it sometimes works, sometimes no. But if the id3v1 is removed, it works 100%.
But, the main annoyance now is 2.4 incompatibility - and problems with foobar.
They were using MediaMonkey and ReplayGain when they worked on it…could it be that MM and foobar use it differently?