You can make perfect melodies with the help of an good keyboard.
Imporant is here the time between keypress and sound.
LogicKeyboard LKB-FLS-APBH-DE FL Studio Astra Keyboard schwarz
Direct for FL-Studio, keyboard with keyboard compared.
Nektar Impact LX61+ USB MIDI Keyboard Controller mit DAW Integration
Very good keyboard.
*This are Amazonlinks.