UMC404HD : If it's still discounted to ¤111, just get it.

Amazingly priced 4-port interface. I mean, it's ¤250-300++ value for ¤111 as of this writing. So this discount is just simply amazing.

I use it with (front-port 1) Vocal dynamic microphone + (front-port 2) Passive Electric Guitar + (front-port 3) Active Bass Guitar + (front-port 4) + Drum dynamic microphone + (MIDI back-port) Keyboard + (front-monitor input) headphones. I use two sets of stereo speakers for which I get separate channel output for in the back (i.e. I use a 2x2 combination).

I use it generally with Windows 10, FL Studio. Haven't had a problem with standard drivers yet. When connected to a computer via USB, it doesn't need any adapter power. But, it can also be used without a computer, so use an included adapter for that.

USB can be set to minimum latency of down to about 5 ms (I think I've heard less, like 3 or 4, but FL Studio shows 5 ms), and I haven't had a problem with that.

As I use a dynamic microphone, I didn't need to use the included 48 V phantom power function, but there is only one button. I know some would like separate buttons, so there's that.