Behringer U-Phoria

This thing kinda sucks. It works for the most part, but it has some odd quirks. As an example, when you lower the volume on the headphone output, eventually the right side will cut out before left. It is also a bit noisy.

It is funny to me when people online adamantly claim you should not get a dedicated headphone DAC/Amp for music but rather an audio interface since they are often cheaper and supposedly have the same - some even claim better - audio quality. Now, my dedicated headphone DAC/Amp has noticeable better audio quality and build quality than this thing. Maybe these people should add disclaimers and/or recommendations to their rants.

One good thing I feel the need to mention however is that it has insert sockets. These allow you to plug effect pedals into your audio line. You could plug the instrument directly into the pedal of course, but for synths that can get a bit hairy since pedals are made for guitars which have a way weaker signal than synths.