On MacOSX you can do a RunProcess call to e.g.:
say -v "Cellos" "Lalalalalala" -o filename.aiff
Then import that file using Import.
Thank you very much, but how about using the Windows system (For example, Windows 10)?
..or re-route the sound output back again using a third-party app. For example, on OS X, with AudioHijack http://www.rogueamoeba.com.
Speak uses the OS speak function, so the waveform is not available for computations, unless of course you record it with a microphone and import the recording.
