I bought one of these USB units and first installed it using the SPDIF output line. It worked but the overall volume level was weak. And it only worked using the Steinberg ASIO driver. Even the ASIOALL2 driver didn't work. Nor did the Komplete Audio Driver listed in Kontakt 8 work. Then I downloaded another driver from NI legacy support for the Komplete Audio 6 windows 10 file. Now I lost the option of using the SPDIF output. The only audio option shows Speakers Komplete Audio 6. Same volume level problem persists. I'm running the output level at 100%. I'm running it all to a Pioneer Elite Receiver that would blow my face off running any other audio software app on the PC. I'm stumped. Any ideas out there?