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.
How much extra postage is required for a square envelope? Quick Answer. In addition to the regular postage rates, the 2014 extra postage fee for a square envelope is 20 cents for a 1oz envelope and 21 cents for a 2 oz envelope (additional fees may be charged for larger sizes).