Hi guys, I have received my Ampeg SGT-DI a couple of weeks ago, it sounds great with my Fender AM II Precision, but I have a problem with the compressor which I cannot explain. I set the general volume of the preamp stage, the EQ and the compression level (around 12 o’clock), and everything works, with the compressor led activating every now and then while I play. Then, I switch the SGT circuit ON, setting a medium grit level. I want to have the same average output volume with the SGT ON and OFF, and to achieve this I have to set the level knob of the SGT at a low position, as the SGT circuit acts as a booster. The result is that I can switch the overdrive ON and OFF with the same output volume. But, doing so, the compressor is more active when the SGT circuit is ON, even if I play much harder than with the SGT OFF. To see again the led of the compressor active, I need to increase the level of the SGT circuit, but in such a way the resulting output volume is much higher with the SGT ON.
The SGT circuit is before the compressor/volume section, so it seems that when I turn the level of the SGT section low, the compressor cannot be activated anymore because the input signal is always below the threshold. But I still have the same output volume… how is this possible? Is the compressor sensitive to the level of the SGT circuit only, not to the grit level (which also boosts the output volume?