Update: Here's a note from RCG:
You can use the mtc-01 on your 9x and I have flown my ladybird using it with stock 9x firmware. but you have to reverse some channels. I recommend you upgrade the stock 9x firmware to er9x, because on the stock 9x firmware the elev and aile channel is swapped and there is no way you can change it with stock firmware. With er9x you can easily change it.