Origin Effects Cali76 Stacked EditionThe gold Thru knob sits at the heart of the Cali76 Stacked Edition. While the input level knob, which controls the pedals studio grade discrete transistor preamp, determines how hard your signal hits the fixed threshold of the first compressor, the Thru knob lets you decide how hard the output of the first compressor hits the second. As well as adjusting the amount of compression occurring in each stage, the Stacked Edition lets you independently