FAT FREE - This one is for the micro builders out there. If you want to build yourself a teeny tiny amp that that will fit in a Fag packet, this build of the amp provides you with just the essentials. The missing Gain switch can be replaced with a Jumper wire (max gain) or left open (min gain) or replaced with a resistor or a trimmer pot to set and forget. You can also ditch the bright switch as well if you are really trying to save space.