Bill,
I just got the chance to test mine and I have to agree with Advent.
This is what I did for my test.
I selected either PMIX 2 or 4 to be on, Never both on.
In both cases, the throttle to rudder mix didn't work (PMIX 3)
I put the 100% deflection on PMIX 1 and tested it as well and it didn't work on the AUX channel.
The only time the AUX 1 channel servo moved is with rudder stick movement.
AUX CH Select is null for all channels except for Channel 9 SW-G Norm
In both rudder mix cases PMIX 2 or PMIX 4 enabled, the ailevator function worked.
I didn't have the wings on so didn't test the flaperon function.
I am using a 9C's serial number 041004818.
Back from service on 9/8/2006
The program was in the TX, I should have asked if you could test it while you had it but I forgot.
I am not sure what else I could do to get it to work other than making PMIX 4 the same as PMIX 3 but make the slave channel the AUX1 servo.
Thanks

PMX 1
Mix off
Mas Ofst
Slv 4:rudd
Sw:C
POSI Center
Rate -100%

PMX2
Mix INH
Mas 4:Rudd
SLV 7:aux1
Link on
Trim on
SW C
POSI Null
Rate +100% +100%
Ofset 0%

PMIX 3
Mix ON
MAS 3:thro
SLV 4:Rudd
Trim off
SW G
POSI Null
Rate +100% +100%
Ofset 50%

PMIX 4
MIX on
MAS 4:rudd
SLV AUX1
Link on
Trim on
SW H
POSI Null
Rate +100% +100%
Offset 0%

PMIX 5
MIX on
Mas Rudd
SLV ail
Link on
Trim off
SW H
POSI Null
Rate -6% -4%
Offset 0%

PMIX 6
Mix on
Mas thro
SLV Elev
Link on
SW H
POsi Null
POS1 0%
POS2 0%
POS3 0%
POS4 0%
POS5 +2%

PMIX 7
Mix on
Mas rudd
SLV Elev
Link on
SW H
POsi Null
POS1 -14%
POS2 -6%
POS3 0%
POS4 -7%
POS5 -14%