In using a guitar amp, it's important to know how to manipulate the amplifier to achieve a number of different effects, including a clean or dirty sound. Learn about using the bass and treble knobs on an amp with help from a professional guitarist in this free video on guitar amps.
A 10 X 13 envelope (must be less than 1/4 inch thick) is considered a flat and costs 80 cents for the first ounce and 17 cents for each fractional ounce after that up to 13 ounces.
For a standard size envelope, the first ounce will cost $0.34 and each additional ounce is $0.21 cents. For any envelopes larger than a standard size (and over an ounce in weight), the initial postage is $0.55 with each additional ounce costing $0.21.