I just told you the gain tags no longer show, they did the first time I got the tags to show but not now so there is nothing to take a screenshot of now.
The screenshot of the extended tags dialogue reveals more than only the presence of certain tag fields.
That plus the settings to read mp3 tags would help to support your case.
Thank you for the additional information.
That looks ok so far as far as I am concerned. These settings should allow you to tag files properly.
Well, it appear as this is a bridge between two worlds then but it seems to work.
I realize Mp3Gain is old and no longer supported but it does what I need it to do and I have been using it for decades. I'm old so I get kind of stuck in my ways until I am shown a BETTER way. 
I will play with the replay gain function in Foobar2000 since I trust everything Spoon does as I have been acquainted with him for over 25 years from my Anandtech days and everything he does is of the highest quality.
The issue is whether my Android music player will support the replay gain used in Foobar2000. It works now because I use Mp3Gain but it is all I have ever used because it has always just worked for me. I need the gain changes in my truck or cars but I use a different gain for when playing on home stereo equipment.
This is why I am in the process of redoing my collection to get a baseline collection that is organized that I can use to copy files from to apply different gains to for different uses.
While I'm talking to an expert is there really any reason to preserve ID3v1 tags anymore? I doubt I use any software anywhere that only read the version 1 tags, it was an issue 20 years ago but something tells me I can get rid of them now.
You are right - meanwhile most players rely on ID3V2 tags.
So unless you have hard evidence that your player needs V1 tags, you may safely remove them.
Please note that there is a function available in the file list context menu>Utils>Remove Tag types.
What player are you using? I can tell you for sure that GoneMAD, Poweramp, Foobar2000 Mobile, Neutron, and Musicolet all use Replaygain tags.
Thanks, I understand how to use the remove tags function as I figured it out yesterday to just remove the APE tags to have my ID3 tags show again so I just have to select remove only the ID3v1 tags and go.
I only see it in File>Remove Tags as I have no Utils selection.
That solves my issue thanks bro!! I use Musicolet as I have found nothing better for Android. I have been using it for over 6 years.
The context menu is the right-click-menu in the file list (file list <> file menu)
Now I just have to figure out how to use Foobar2000 to do album analysis and gain changes.
Yeah, OK I get that and have used that on single files and selections.
I informed you about the different approach of Fooobar2000 and Mp3Gain. Mp3Gain changes the audio-part of the mp3s.
So before you delete the ape-tags created by Mp3Gain you have to "undo" the changes that Mp3Gain made to the audio-part. You can recognize if undo was done by the value of the tag MP3GAIN_UNDO. The value will be 0.
If you only used album-gain in all cases it is not a big problem if you forget this, because the loudness relation between the files of an album were kept. But if you want to get back to the original loudness of the album-files before you now let Foobar2000 analyze it is essential.
Yes, thank you. I have known about the fact that although Mp3Gain makes changes to the audio it is non destructive if you take care. I do album gain because it is preferable to me because I come from the album rock era. And if I ever decided to change the gain of files I always undid the gain first to go back to the original gain for the file as ripped.
This is what I was trying to establish when I found the problem with APE tags and Mp3Tag. I only ran the analysis with no gain change. This was on purpose to establish a baseline for my collection and to make it more efficient to change gains because all I have to do is copy the albums from the baseline collection to a new folder and apply the gain. The files I am working on now will never have gain applied for this reason.
It was because of this and that I only ran the analysis without any gain applied that I was able to go back by simply deleting the APE tags only to get to the original file.
I will delete all the APE tags in all my newly created files that have not had gain changed and stop using Mp3Gain until I try out Foobar2000's implementation of replay gain...or some other programs. This way I can figure out what suits my needs the best and still maintain my baseline collection.
I just have to research how to do this in Foobar2000 and how to load many files at once. Is it all behind the scenes and you just get a gain change or can you view the results of the analysis first? If I cannot see what is happening then I may stay with the dinosaur.
You can get more specific help on foobar2000 at:
https://hydrogenaudio.org/index.php/board,28.0.html
Short version of use:
After installing foobar2000, click on FILE > PREFERENCES > TOOLS, then select ReplayGain scanner to set options.
I use: EBU R128, downsample hidef content (automatically), true peak scan (auto 4x), and the following album grouping: %album artist% | %date% | %album%
With this, you can simply load up all your files in foobar2000, select all, right click, then choose ReplayGain, then "scan albums by tags". This will allow you to add both album and track RG values to RG tags within those files in a batch manner, with foobar2000 correctly recognizing each album as a separate album to be analyzed.
I've been using foobar2000 to analyze and add RG tags for many years and never had any issues.
edit: note that foobar2000 adds replaygain tags to be used by RG-aware players. It does NOT do the sort of actual audio gain adjustments to the the audio data that mp3gain does.
Thank you for the information and I am aware of how ReplayGain uses only values in tags that a music player must support in order for it to work but I use Musicolet on my phone most of the time and it was confirmed earlier in this thread that it does suppoert RG playback so I am all good there.
Now I just need to figure out if emby supports RG when going from my computer to home stereo.
Thanks for the help. I loaded up a directory of copied files to play with and I scanned the files as albums and up pops a window with the results of the scan. It is fast, very fast, compared to Mp3Gain.
Now it asked when the scan was done if I wanted to update the files' tag info. If I choose that does it then write the gain tags based on the target db that is already set in the RG setting to actually change the gain or just the results of the analysis so you don't have to run that again?
When you allow it to update, it either writes the ReplayGain tags (both Album and Track tags) to the files (or updates the existing ReplayGain tags for the new values created by the foobar2000 replaygain scanning. After this you are done. Each file has the appropriate TRACK and ALBUM replaygain tags that can be used by RG aware players. Foobar2000 uses the LUFS -18 as the target standard (as does dbpoweramp).
Since it contains both track and album gain tags does that mean that in a player like Musicolet if I que up an album then it uses album gain but if I have the player set to random playing of tracks (even if I queued up every Cars album for example) then it uses the track gain? If it works this way then yes, this is much better than Mp3Gain.
Different players have different implementations. In theory the answer is that yes, it is possible.
BTR AMP (iOS), GoneMAD (Android), Poweramp (Android), Foobar2000 Mobile (iOS/Android), and Musicolet (Android) currently only let you choose one or the other. I recommend using Album mode so when listening to complete Albums the playback sounds consistently correct from track to track.
Neutron (iOS/Android) is the only mobile app I am aware of that lets you choose Track mode by default but can switch to Album mode automatically when choosing to listen to an album when not in shuffle mode.