The midi data for the Function keys changed at or before firmware v1.1 for the X-touch one. I discovered the correct data using Midi Monitor. The correct settings for F1 - F4 are:
Widget F1
Press 90 4A 7f 90 4A 00
FB_TwoState 90 4A 7f 90 4A 00
WidgetEnd
Widget F2
Press 90 4B 7F 90 4B 00
FB_TwoState 90 4B 7f 90 4B 00
WidgetEnd
Widget F3
Press 90 4C 7f 90 4C 00
FB_TwoState 90 4C 7f 90 4C 00
WidgetEnd
Widget F4
Press 90 4D 7f 90 4D 00
FB_TwoState 90 4D 7f 90 4D 00
WidgetEnd
Widget F5
Press 90 4E 7f 90 4E 00
FB_TwoState 90 4E 7f 90 4E 00
WidgetEnd
The midi data for the Function keys changed at or before firmware v1.1 for the X-touch one. I discovered the correct data using Midi Monitor. The correct settings for F1 - F4 are:
Widget F1
Press 90 4A 7f 90 4A 00
FB_TwoState 90 4A 7f 90 4A 00
WidgetEnd
Widget F2
Press 90 4B 7F 90 4B 00
FB_TwoState 90 4B 7f 90 4B 00
WidgetEnd
Widget F3
Press 90 4C 7f 90 4C 00
FB_TwoState 90 4C 7f 90 4C 00
WidgetEnd
Widget F4
Press 90 4D 7f 90 4D 00
FB_TwoState 90 4D 7f 90 4D 00
WidgetEnd
Widget F5
Press 90 4E 7f 90 4E 00
FB_TwoState 90 4E 7f 90 4E 00
WidgetEnd