The tag 'analog audio' is only used once. This is the project:
one-way RF communication
one-way communication with RF module TWS-434 & RWS-434N
one-way Arduino communication with RF module TWS-434 & RWS-434N
one-way communication with RF module TWS-434 & RWS-434N
one-way Arduino communication with RF module TWS-434 & RWS-434N