Hello Im new to amp head and was, wondering about this head and wanted to see if I could find a more direct answer. So I was wondering about the post and pre eq. I had a little dabble with a direct line out to the Mixer and was wondering why I can't dial in my tone, moving the knobs doesnt make a difference at all...Do I require a speaker load to get the tone dials to work? As well as this are these amps safe to DI without a speaker load? Any information would be great thanks.