To install Tapir, download the package and unzip it into a suitable directory.  The fact that you're reading this suggests that you've probably already done this.  Now open a command prompt, change into the directory and run:

java -jar Tapir.jar input_file output_file

(This assumes that you've got a sensible installation of Java that puts the interpreter in your path.)  "input_file" is the name of the file you want to modulate.  Keep it small for goodness sake or Java will take all your memory away and set fire to it.  "output_file" is the file that you want to contain the modulated data.  It'll be a standard .wav file, so you might want to give it a ".wav" extension.

That's all!
