down
Once you have that working, you can solder wires to the Pot Vol pads, so you can place the volume adjustment pot
elsewhere (say mounted to the outside of a box)
If you want a potentiometer that will fit exactly in the slot, check out this side-adjustment pot
http://www.digikey.com/product-detail/en/bourns-inc/3362M-1-103LF/3362M-103LF-ND/1088401
For mounting onto a box or panel check out https://www.adafruit.com/products/562 (http://adafru.it/562)