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1. Audacity: Audacity is probably the most widely used and free audio recording software programs, capturing the hearts of both sound engineers and casual audio mixing crowd. It can be used for audio recording from microphone, file conversion, cutting, copying and editing sound files. Its supported audio file formats include MP3, WAV, AIFF and OGG Vorbis. The Beta 1.3.13 is its latest version, that is now appropriate for windows 7, Windows Vista and Mac OS X 10.6. During the year 1930 there was clearly one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees the period introduced two Mirrleesengines represented this patent way of the valve engine. Well the previous had bore close to 5.5 inches and made a stroke of just about 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. one other had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder with the rate of 200 r.p.m.