What does this do?
You question the witness and at the end of the call hang up. Between 15-30 minutes later, you'll have a transcript of the interview e-mailed to you along with a digital recording of the conversation. You get the automatic recording and the transcript in one fell swoop.
By setting up a conference call with Speak-Write, you eliminate the need to for having the equipment to digitally record the conversation yourself and you eliminate the need to hiring your investigator to take the statement. You also eliminate the cost of the investigator.
There's more in Swanner's post: "Making Transcripts of Client and Witness Interviews.