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.
Postage for Square Envelopes. If you are mailing square wedding invitations you may be in for a surpriseâthe USPS imposes an additional surcharge for square envelopes. Letters that are square (height = width) are considered odd-sized or nonmachineable by the post office resulting in a higher price for postage. Square envelopes will cost you an extra $0.22 per letter in addition to the postage required for the weight and dimensions of your envelope. For 1 oz letters this means you'll need a $0.71 stamp (instead of a $0.49 stamp) and for wedding invitations that weigh 2oz you'll need a $0.93 stamp (instead of a $0.71 stamp).