I had same issue trying to map assignments to new/2nd throttle quadrant, but got to work without any third party assignment software.
Original setup was for single engine planes using Saitek (Logitech) Pro Flight Yoke with Throttle Quadrant ("socket" conn. to Yoke).
Just recently switched to flying the Baron G58 twin engine and added 2nd throttle quadrant that has USB conn.
Desired lever order assignment:
First throttle quad with "socket" conn:
Throt Eng1, Throt Eng2, Prop Eng1
Second throttle quad with USB conn.:
Prop Eng2, Mix Eng1, Mix Eng2
Here's the assignments that work for me:
Throttle 1 - Throttle 1 Axis - Joystick L-Axis Z
Throttle 2 - Throttle 2 Axis - Joystick R-Axis X
Prop 1 - Propeller 1 Axis - Joystick R-Axis Y
Prop 2 - Propeller 2 Axis - Joystick L-Axis X
Mixture 1 - Mixture 1 Axis (0 to 100%) - Joystick L-Axis Y
Mixture 2 - Mixture 2 Axis (0 to 100%) - Joystick L-Axis Z
Steps I think I did to get it to work; I tried many.
1. Do not connect USB throttle quad yet.
2. In MSFS, delete current throttle, mixture, prop mappings (under Saitek Pro Flight Yoke)
3. Save settings
4. Disconnect throttle quad with "socket" conn. from yoke
5. Connect throttle quad with "USB" conn. to yoke
6. Under 3 Axis 9 Button Joystick, do mappings in this order: Mixture 2, Mixture 1, then Prop 2
7. Save settings
8. Reconnect throttle quad with "socket" conn. to yoke
9. Under Saitek Pro Flight Yoke, do mappings in this order: Prop 1, Throttle 2, and Throttle 1
10. Save settings
Worked for me. Best wishes, good luck and happy flying.
