Hi,
I play Bb trumpet and use the global transpose. This sometimes leads to strange results.
For instance, in Body and Soul, the middle part is in the key of E (four sharps):
Emaj7 F#m7 | Emaj7 Am7 D7 | G#m7 C#m7 F#m7 B7 | Emaj7 etc.
but iReal b notes this as
Emaj7 Gbm7 | Emaj7 Am7 D7 |...