Aldo is a Morse code tutor. At this moment Aldo has four kinds of exercises: 1. Classic exercise: With this exercise you must guess some random strings of characters that Aldo plays in Morse code. 2. Koch method. 3. Read from file: With this exercise you can write something in a text file and read this file with Aldo. 4. Call sign exercise: With this exercise you can training yourself receiving random generated call signs.