Just making sure machine is working as intended. PowerUltra205P - panel switch is set to "pedal". Depressing pedal, then releasing it, amps will go from approx 5 to 200, then back to 5. Panel switch set to "panel". Amp control knob set approx 1/2 way. Depressing foot pedal, then releasing it, it will only go to amps set by knob, but no gradual ramp up then down, just acts as on/off switch. Is this correct operation? Thanks