To add warmth to the sound a 12AX7 tube (valve) is incorporated, regulated by the warm/cold control with the harmonic level displayed on a dedicated meter. Both attack and release time is variable or can be switched to auto mode to aid setting up. Thecompressor‘knee’ can be changed from hard to soft (interactive) depending on the application. The output signal beneits from a variable threshold peak limiter and a stereo couple or dual mono mode of operation is available.The four round, retro illuminated meters and large chrome controls relect the build quality of the VTX2 as do the multitude of classic toggle switches. A hard wired bypass switch provides A/B comparison or power fail back up.Connections to the VTX2 is via balanced XLR and jack sockets and operating levels can be switched between +4dBu and -10dBV. front panel of via USB to a computer using the software supplied.