Hey there,
What exactly are you sending out of the midi maestro? Are you sending the command to a channel the Aeros is listening to?
Could you send a picture of the custom mode button set up(s) on your phone for the button(s) you are using to change parts? I’m assuming you are using a custom mode and not the default mode
Mind that the BeatBuddy will only change the Aeros song part in 6x6 if a song part other than the current one is selected, you can avoid this issue by having both units respond
Are you currently on version 5.0.3?
Let me know!