This is Back To Basic 9. This software basically is hacking the keyboard so when we are typing on the keyboard, it will produce sound. We can key in the key from A-Z and with some keys that stay on the left side of the Enter key.
The software startup.
File > Open Setup
Then look for .btb files, ONLY.
After loading the .btb files, the interface will change into another color. During the startup, there's no sound if we push button on our keyboard.
Notice that sound files will be loaded into this area so when we are typing, sound will be triggered.
This is how it looks like when we are typing it.