It's free but donations are welcomed.
POWER - Power ON/OFF.
DRIVE - Determines the amount of gain applied by the Pre Amp.
LOW, MID, SWEEP, HIGH - Tone Stack controls.
POW AMP - Determines the amount of gain applied by the Power Amp.
OUTPUT - Output level.
After Nick_Crow_7170_Lead insert some guitar cabinet emulation.
I forbid it's sale, modifications or sharing it over internet without consulting this with me, the author.