I just tried to use the virtual heaters 100,101,102 to control a fan (no. 0) as follows:
M950 F0 C"duex.fan3+duex.fan4" M106 P0 T45 H100:101:102
Unfortunately I get the error "Sensor number out of range". Is there a new way on how to utilise the mcu temp and driver temp for fans?