FSK+FDMA

Hi, In one of my project, I need to send audio signals from HOST to the person. Audio signals will give directions (Left, Right, Go Straight, Stop, Go back) in accordance to some algorithm. Sometimes, it is required to send different audio messages to multiple persons by the host. How can we acheive this? I thought that I can connect a FSK modulator to the HOST and each channel is tuned to each person using FDMA or OFDMA, The directions are pre-coded. 000 - Left 001 - RIght 010 - Go Straight 011 - Stop 100 - Go back These codes are then decoded and by means of micro controller, audio messages are allotted to the codes. According to the instruction, mirco controller will send the pre-coded audio message to the headset. Is it feasible solution? If not, what is the best possible approach to acheive this idea? Thanks!!