Nio is well suited to the studio and mobile recording rigs. As well as a stereo pair of RCA/phono inputs (for DJ mixers, keyboards etc), a 1/4" jack and an XLR input mean you can record vocals and guitars straight into your music software.

The 2 headphone outputs can be independently controlled, so 2 performers, or an artist and an engineer can have different levels simultaneously. 

With 2 pairs of outputs on RCA/phono jacks, the first can be routed to a pair of studio monitors, and the second pair can be sent to anything; including hardware FX. bus compressor, or even another recording device.