DMstrat

Just got a Spider IV 75 watt. and as a senior in his 60's. boy this is tough to figure out. My first basic question is: First thing I did was a factory reset to start from the beginning. Went to preset 10a (Lakes) and the only thing I wanted to do was turn up the volume so I used the Channel volume to do this. Turned the knob up and volume went DOWN and became fuzzy. I know the unit is in good working order so what did I do wrong?? All I wanted was more volume!