@hackage mmsyn7l0.1.0.0

For the proper proceeding you specify a String, which consists of 4 digits (and it may be preceeded by a symbol "-"). If the String begins with the "-", then a sound amplitude decreases, otherwise the amplitude increases. The level of increase / decrease is determined by the magnitude of the absolute value of integer numbers. The greater is the number -- the greater is the amplitude change. The count begins with "0000" and ends with "9999" (the sign is not taken into consideration). In such a case, for the Strings without the initial sign "-" (the sound increases) an interval between the maximum by modulus value of the amlitude (which is represented by the parts of 1) and 1.0 is divided into 10 equal parts (starting a count from 0) and then that one of them is selected, which has a number determined by the first digit in the String writing. Then (if specified further) the interval between this amplitude value and a value, which corresponds to the selection on the previous step the next first digit in the writing (for example, after "4" -- "5", after "7" --"8" etc.), greater by 1 than the actually selected one, is also divided again into 10 equal parts and that one is selected, which corresponds to the number determined by the second digit in the String writing (again beginning with "0" and ending with "9") and so on until the 4th level. The greater exactness is not needed because our hearing ability hardly distinguish such a subtle sound changes. If the String has as a first element the "-" Char (the sound decreases), then everything is analogously the same, but an interval between the maximum by modulus amplitude value and 0.0 is divided into 10 equal parts and so on.