"Speak" is a function that can "speak" the string variable in English. For example, Speak["thank you"] will make the computer speak "thank you", but I can't use this sound to do other things: Audio or Sound function cannot record the result of Speak function. There will be mistake if we run
Audio[Speak["thank you"]]
or
Sound[Speak["thank you"]]
, so I can't output the "thank you" sound or analyse the waveform or spectrum of it. How to deal with it?