This sound card comes with a built-in DSP chip, and all effects are calculated in the DSP chip, without occupying computer resources. Many major broadcasters end up switching to this sound card for live streaming. Internal recording is supported, but there is no virtual channel. If you want a sound card with good recording quality, it is your . This sound card is mainly portable, and the for can directly power it. For the sake of good sound quality and low latency, I only recommend this one. In the professional recording and arrangement sound card, only its official driver perfectly supports all settings for online karaoke and live streaming 1.GAIN GAIN knobSets the volume of the microphone or line nput signal supplied to this channel. The GAlN knob is used to adjust the sensitivity of he microphone and lineinput signal. This allows the external signal to be tuned to the desired internal control level. 2. High impedance [-Z] switch buttonTo connect the guitar directly to the ixer without using the Dl box, press this switch first: Then connect the output of the guitar to the channel TRS input.The optimized input impedance ensures direct connection and high frequency fidelity. 3. MIC/LINE/XLRinput interfaceUsed to connect microphones, Musical Instruments or external audio equipment.The multi-function jack supports both XLR and PHONE plugs. Audio Interface Recording Sound Card Material: plastic colour: black Package Contents: 1 x Audio Interface Sound Card 1 x USB Cable 1 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.