SO here is the finished board.
The final step is to add the sound files to the SD card. The DFplayermini can play mp3 files. You can record you own effects using free software like audacity. I grabbed some short clips from youtube and recorded the sound.
The files have to be named in a specific manner for the DFPLAyer to read.
You can store 4 different files -one for each button on the transmitter
the files must be labelled;
0001.mp3
0002.mp3
0003.mp3
0004.mp3
File 0001 is triggered by pressing button A
File 0002 is triggered by pressing button B
File 0003 is triggered by pressing button C
File 0004 is triggered by pressing button D
darbyvet attached the following image(s):