I really haven't a need for a guitar tuner, but it is quite amazing. I do like to experiment with "faux gold" elements and this file gives you a ton of swaches and gradients to play with.
Use the swatch palette options (the little arrow in the top right) to "select all unused" and trash those, then "add used colors". This gives you a cleaner look at only the colors you need. I saved that swatch library as "Gold" :)