Shure SRH840A Professional Studio Monitoring Headphones Keyboard Hardware What you've got here is

What you've got here is a pair of CMC 6 microphone amplifiers paired with MK 4 cardioid capsules

Their send levels are controlled for each instrument plugin from AURA’s mixer page

Yamaha EMX5014 Rack Ears

but packs the performance of a true 90 watt guitar preamp / power amplifier all in a package size of 1

Shure SRH840A Professional Studio Monitoring Headphones Keyboard Hardware What you've got here isDeveloped to provide accurate and well balanced audio, the new SRH840A Professional Monitoring Headphones are optimized for critical listening and studio monitoring. A precisely tailored frequency response and 40mm neodymium dynamic drivers deliver rich bass, clear mid range and extended highs. A wide, padded headband and collapsible design combine with Shure durability to provide the ultimate listening experience.