From what I've read, MMW uses the default of 89.0 (which I know is the industry standard). Q4: I am thinking of using MMW to modify/change gain values of future music purchases. Right now I have my entire collection on my phone and I was using Poweramp but I've recently downloaded and paid for MMA(Pro). Q3: Which volume data will be used by my music app. Q2.1: Does MMW save gain edits to different types of tags than MP3Gain (V1 vs. There is nothing in Album Volume nor Album Gain columns as I rarely scan/modify the Album Volume. Now when I check MP3 gain, it shows Volume around 90.0 (90.0 dB is what I have the target volume set for) and Track Gain is shown as 0.0.
Mp3Gain PRO does not change the volume level of a song in a uniform way, as classic programs did. The 'formula' used by Mp3Gain PRO is completely novel, because, unlike programs such as Mp3Gain, allows you to 'rearrange' the volume levels of any mp3 file.
I.e.: in MMW, Black Label Society - Order Of The Black, all tracks have 'Track Volume' of around -10.5 dB and 'Album Volume' are all -11.3 dB. Mp3Gain PRO is the ideal solution to correct volume level problems in your MP3 files.
Q2: I noticed in MMW some of my music has values in one or both of the 'Track Volume'/'Album Volume' columns yet the values in these columns are not the same values that MP3Gain reports. Q1: I noticed in MMW most of my music does not have any values in the 'Track Volume' nor 'Album Volume' columns even though I know that the tracks have been analysed and gain has been applied by MP3Gain. To this day I still use it exclusively for setting volume. For decades I've been 'normalizing' my MP3s with MP3Gain. While I've known about MMW/MMA for some time I've only recently started using MMW exclusively to manage my MP3 collection.
For years I've been using other tools to manage my collection.