After the concept of key combination came out, many people realized key combination through software developed by Hao and even themselves. This is not difficult for people who understand program development. The difference between keyboard speed recording and speed recording is that speed recording is more professional. At present, the limit of keyboard speed recording is to type one syllable code, while speed recording is generally to type two syllable codes. If you type for a long time, speed recording will undoubtedly be easier. Of course, the advantage of keyboard combination is that you don't need to carry a speed recorder weighing about one kilogram, or even spend money, although it is not professional enough. In addition, I would like to talk about some charging software called keyboard speed recording, such as Yao Fei, Five Pairs, Ultrasonic and Guoyu before. Actually, there is no need to waste money on this. Because its program is not complicated. Supersonic recording doesn't even need to tap the keyboard technology, but it just changes the double spelling of many keys and uses the tone auxiliary code.