How To Do Rapid A Button In Visual Boy Advance How To Do The Rapid Fire Using The Handgun In Devil May Cry 1?

How to do the rapid fire using the handgun in Devil may cry 1? - how to do rapid a button in visual boy advance

I saw this clip on YouTube and with the weapon, but with a machine gun in his performance, I tried it myself, but line breaks, not hot enough, I think his technique.