It's strange, because I assure you that from the very beginning, your "wah wah" sounds make the following melody: Bb F D. And later your bass plays F G and C. I have no idea why, but I'm 99.97% sure that's it.
If others are reading this message I would like to have a confirmation.
The bass is C# - G#, then G# - F# and back, so it’s kind of close.
And I can understand the wah sound can be confusing, it’s not the most readable thing, it is actually the same as the xylophone at 0:10, but with less notes.
This is the wah pattern, the white lines mark black keys:
