the framework is now there in the Sound Blaster emulation for recording audio in general, though at this time, only generated fake source are supported. They are: silence, hiss, and a 1KHz test tone. If you record audio in the guest the recording should contain that generated audio.
default to the fake silence source until the user confirms with the interface they do in fact intend for the DOS program to record them
Faking input from a WAV file
There are 6 DOS, 30 Win3.x games and over 50 Win9x games supporting microphone input.
DOSbox-X:
Some further TODO items (and lists of games and software):