Here's all the details directly from SM Pro Audio...
Our new Nano Patch+ is the perfect symbiosis of our bestseller Nano Patch and our iNano. You also could say the Nano Patch+ is the Nano Patch with the mini jack I/O of the iNano and it's silver colour. Something else? Well yes, it has the same price as the Nano Patch. Nothing more and nothing less. It's that simple.
The Nano Patch+ really comes into its own when connected between your computer audio interface/soundcard master outputs and a pair of active (powered) monitor speakers. One of the benefits of passive volume attenuation is that you no longer have to control volumes with your software's master volume fader. Reducing levels from your software only reduces the audio bit depth. It is much more appropriate to keep your software masters at unity and attenuate the audio to your active monitors with a passive controller like the Nano Patch+. This way you can maintain maximum audio resolution and attenuate your monitoring volume with the confidence that the sonic integrity of your audio is not compromised.
No active circuitry, buffers, transistors, batteries, or power supply of any kind can interfere with the main passive output of the Nano Patch+. It simply delivers attenuated signal. Pure, simple transparent.
The Nano Patch+'s rotary control (the same pot as used in our M-Patch 2) allows precise level adjustments within 1dB from 0 to -40dB. In addition, the Nano Patch+ features completely balanced operation with its combo XLR/TRS input jacks, TRS outputs or mini jack I/O.
A problem solver, you use the Nano Patch+ anywhere you need to trim gain; ie, reduce the volume of analog audio signals. For example, you could use one to trim the output of a microphone pre-amplifier. With its high-quality potentiometer, the Nano Patch+ passes signal more accurately, and sounds better than most built-in volume controls. The possibilities are endless. Features
Super compact 2 channel analog passive volume control