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Can FL Studio Mobile control external synths?
I can't find this information anywhere. They say "to an extent", but I don't really know what that means.

Comments
The current version supports core midi , Line 6 midi mobilizer and core midi background apps. But I have not personally tried to control any hardware from FL Studio. It says it can on their FAQ
https://www.image-line.com/flstudiomobile/support.php
The current version also works with inter app audio instruments.
I have controlled external hardware with fl studio mobile using the CCK. Worked great. But it was a few OS versions ago. I can test it again if you need.