@Buddy Loving the sound board and all your great features so far! I think, as several people have already mentioned, that a way to play computer audio or import and play audio files on the call would be great. This could also be an easy method for a text-to-speech as someone could just record their computer speaking pre-written text and play that back over the call.
Also, is there a way to donate? I love your service and want to help keep it going in any way possible!