there is different software suplied with both. One uses the USB/COM3 (the GMC300) and my GMC200 uses the audio output. Any suggestions? Win7, with sub-par amateur PC and software skills!
MEANT to mention: Basically only the GMC300 software works. The GMC200 audio software does nothing with my GMC200 plugged in via audio input. Help?! :-)
You can use GMC-200 with USB connection at same time with GMC-300. As long as they are on different comport, then you can run the two copies of the software at same time.