ART Pro-VLA II Two Channel Vactrol-based Compressor<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> VCA-Less Vactrol Opto-Compression Design， Mastering Quality Audio Signal Path with Tube Gain Stage， Variable Threshold， Ratio &amp; Output Controls </span></li><li><span class="a-list-item"> Enhanced Link Mode - While in stereo link mode， channel 1 level control acts as a master output level and channel 2 becomes a balance control between them， - optimizing the Pro-VLA II for use as a mastering tool </span></li><li><span class="a-list-item"> LED Backlit VU Input/Output Level Metering Indicates Both Average Level And Peak Hold </span></li><li><span class="a-list-item"> Accurate Ten Segment LED Gain Reduction Metering. +4dBu/-10dBu Mode Switch Optimizes Pro-VLA II For Interface with Professional OR Consumer Grade Components </span></li><li><span class="a-list-item"> Active Balanced XLR And ¼-Inch Inputs &amp; Outputs. Toroidal Transformer Reduces Mechanical &amp; Electrical Hum </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41jpolZ9uJL.jpg" noproxy>