After you add the melody, did you save the song? Did the file extension change from "song.sgu" to "song.mgu" when you saved the song file that has the melody?

If the song has a melody the extension will begin with M (otherwise it’s S). The second letter of the song extension is G to indicate it is a song file. The third letter of the file extension is the style used in the song. 1-9 and A-N for the original built in midi styles and U for a User style.

Example: My Song Title.MGU
The M tells us that a Melody is recorded.
The G is always present in song names telling us that it is a song.
The U tells us that the style is a user style.

Example: My Song Title.SG1
The S indicates that no melody is recorded.
The G is always present in song names telling us that it is a song.
The 1 indicates original midi style #1, which is Jazz Swing.

Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home