One common operation is to map values from one range (say, 5 to 10), to another range (say, 35 to 120). For this, map functions are provided.
Map functions included in the music library, so, in order to use them, you need the following in your program:
from music import *
Map functions are used to expand, contract, or offset data values. They convert a numeric value from one range to another.
For example, mapping the value 0 from the range 0..100 to the range 10..20 results in 10:
>>> mapValue(0, 0, 100, 10, 20) 10
Notice how 0 is the leftmost value in its range, as is 10.
Similarly, mapping 50 from the range 0..100 to the range 10..20 results in 15:
>>> mapValue(50, 0, 100, 10, 20) 15
Again, notice how 50 is in the middle of its range, and so is 15.
So, map functions maintain the relative position of a value.
NOTE: If you use float numbers, mapValue() will return a float value that is properly scaled (preserving accuracy):
>>> mapValue(49 , 0, 100, 10, 20) 14 >>> mapValue(49 , 0, 100, 10.0, 20.0) 14.9
Notice how in the second example, 49 was mapped to 14.9, since the destination range was float.
Function  Description 
mapValue(value, minValue, maxValue, minResult, maxResult)  Takes a number within one range and returns its equivalent within another range. The arguments are:

mapScale(value, minValue, maxValue, minResult, maxResult, scale, key)  Takes a number (i.e., MIDI pitch) within one range and returns a its equivalent within another range, quantized to the pitch class value in scale. The arguments are:
