At the bottom of the interface are five global function buttons (including Bypass) and a pop-down panel containing controls for a couple of them.
Activating Distortion simulates the distortion generated by the current device as if the input signal was arriving at the SPL set using the Distortion slider in Edit mode.
Noise mixes one of 14 sampled real-world ambience noise loops in – Street, Park, Mall, Subway, etc – for ‘environmental’ auditioning. The Noise level is adjustable down to -30dB, and, crucially, it’s appropriately filtered when used with the headphone models.
The Mono button switches the output to monophonic, based on the left or right channel, or both, or swaps left and right, depending on the setting in the Channel Mode menu.
Lastly, clicking Auto sets the plugin cycling through the 12 loaded models at a step rate of 1-12 seconds, as set by the Time knob.