Not an upload but this is a taster for what is to come.

The spectrum analyser is completed and nothing like the primitive free version previously uploaded here.

The images start with a voice capture using SOX and displayed at 5mS/Division, Note the red CAPTURE mode inside the top little window. In the COMMAND window the command SPECAN is ready to be entered.

Once entered the next image prompts for an External source for measurement input, for example the external microphone. 'N' will be entered and a 48000 byte main capture raw file is converted to an 8000 byte version for the limited 4KHz resolution of this code. I will try and extend to at least 24KHz resolution at a later date.

After a few seconds the spectrum displays this low resolution capture. This will automatically switch from main red CAPTURE mode to green STORAGE mode for the last image to write protect the current main capture. This display awaits an ENTER to return to the STORAGE screen of the original capture.