What replaces RCx_FUNCTION?

hello all,
I got a question in ArduPlane 3.8.0beta5. I connect my parachute with RC7,Generally,with arduplane 3.7.1 stable,I set RC7_FUNCTION to 27 for parachute,but now,I cant find RC7_FUNCTION param,Can you give me some advice?thnaks.

RC in and servo out were split, so for the ouput look at SERVO7_FUNCTION !

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woo,amazing!Your research is really thorough,thank you for reply~