Hi. The JTech digital audio extractor is for getting the sound out of an HDMI signal, in other words a video signal such as from a PC or a Blu-Ray player. What you need to get the sound of the Volca Drum into the PC is an audio interface. There are lots of choices available, and the price generally depends on how many inputs the interface has, in other words, how many instruments you want to connect through it. A basic audio interface would be something like this or this.