There is no box..... Then the script should accept a response to that question.

It is correct that there is no box. It is incorrect that the script should accept a response to that question; your script does nothing of the sort. Your script reads from STDIN. Your script doesn't produce an HTML form. It should. Without that, it will never work as you want it to in a CGI environment.

See my post earlier in this thread. If you plan to produce a CGI script, you need to know how CGI works. Currently you do not. It's not hard to gain this understanding. But you do have to do a little research.

There's no point in us spending all day typing up a reply here that explains how CGI works, because that has already been written many times. Start with the links I provided earlier. And understand that if you don't present the user with a form, you aren't going to get a meaningful reply.

You may have the amplifier with a mic input, but you haven't got a microphone plugged into it yet.