I am now using Dragon version 10 and in the past I had used Dragon version 7, Dragon version 9 with Hal. I can remember Dragon adding words for what seemed no reason, ages ago I had built and audio filter for use with Dragon which improved the signal-to-noise ratio, just about all the microphones I had tried would give a signal-to-noise ratio of approximately 19 DB, using the audio filter I was able to increase this to 27 DB. Dragon has also improved their speech recognition program to reject unwanted noise, coughing into the microphone would yield a series of question marks without putting words into the dialog box.
One of the main reasons I purchased this version of Dragon is because it is available with the Bluetooth headset, at this time I am unable to use the audio filter but the signal-to-noise ratio is 23 DB, much more comfortable and convenient than the normal headsets.
Carl2