6i25/7i76 TB3 Encoder Jumper Settings - mixed mode possible?

I understand there are 3 jumpers on the 7i76 board that switch the encoder inputs from differential to single (TTL) mode. What I would like to know is can I do a mixed model?

Have the A and B legs differential coming from an encoder on the motor but have the index as single/TTL coming off a sensor (proximity or hall effect) that is directly on the spindle. This setup being to remove issues with variation in gearing between motor speed and spindle speed. I can use scaling for the speed side of things but from what I have read having an accurate index trigger on the actual spindle gives better co-ordinate movement.

So if yes, what jumper is tied to what leg?
Thanks,
James.

Yes, each channel can be set individually.

The jumpers are arranged in the same order as the encoder connector:

W4 IDX mode
W5 B mode
W6 A mode