hi list . . . dos anyone now witch object mixes the signal and the amplitude together to a signal . . ?

i want to mix the amp/freq of two voices . . ..but the results i got do not sounds like i got it right . . .

[rfft~] | | [framp~] | | [ ? ? ? ? ] | | [rifft~]

. . . .my somthing like this . . .?

thanx nos