I read all your material but did not look at your song yet.. I don't think Nathan Hein said the slash roots are 'wrong' and I think it's needed in the bass.

I then looked at The New RealBook Vol. II, both the Bb version to make sure the chord in bar 4 was right (it is) and to check the chord in bar 13.

As a result, I have altered my song as follows, and it sounds great:

changed the tempo from 70 to 60; matches the tempo marking in the fakebook and is the recorded tempo of your choices of RealTracks

changed the chord in bars 1,5 and 17 to DbMaj7/Bb [note: this and all other chords here are concert key]

changed bars 10 and 12 to Bb7susb9

changed bar 13 to DMaj7#5

and a small change of bars 2,6 and 18 from Ebm7 to Ebm9

One more thing. You had a repeat of the first four bars, and for some reason, it played correctly for the first time through but not the second. I'm using the newest build of version 2021 and mine sounded just like your MP3 which was clearly wrong starting around bar 7. So I dropped the repeat, added four bars and copied 1-4 into 5-9. Now it sounds right. I'm not sure why the repeat didn't work correctly and will follow up on that.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.