How to turn a practice amp into a talk box
You need a compression driver
Add a 2 way switch to select the original speaker or the compression driver
Drill out 2 tubes of a gazebo corner so they meet and blank the other 2 with mastic
Plug in a hose connector and the compression driver
Drill a tube hole in the case
Add the talk tube
Position the driver in bottom of case
Finished talk box amp
