thank you very much for the detailed answer! I started to get worried because I was connecting the combo amp to the headphone input and audio output. And I like the sound through the headphone output more, it has more harmonics. I also tried connecting the emu 0204 audio card with a stereo cable, and the headphone output also sounded more detailed. Therefore, I began to worry and thought that this was a problem in the device itself. But if on your hx sromp there is also a difference in sound between the headphone output and the audio output, when connecting the same combo amplifier, then I will be calm)). If it's not difficult, check on your hx stomp. Thank you so much!! I'm from Ukraine, that's why I speak English so badly, sorry)