Good quality audio input is essential to good recognition accuracy with vScription VR. Because of this, it is recommended to NOT use any internal microphone for recognition but a decent quality USB microphone such as the Plantronics Audio 610 USB or the Nuance PowerMic III.
The best results we’ve found is through the Wireless Mic App. It has the best performance and audio levels on OS X and Linux systems and is the most flexible. Best off, there is no extra cost for it and it is included with your subscription cost!