Similar to a weighted action keys, but with less resistance and a slightly springier release, semi-weighted keys are popular with many players. If you don’t need realistic piano response, but also don’t care for spring-loaded synth actions, a semi-weighted keyboard might be ideal for you.
The amount of keys the controller has on the keyboard.
3.has velocity-sensitive pads
Velocity-sensitive drum pads allow you to modify the sound sample's pitch depending on how quickly you hit the pads. They provide a more natural audio experience, as the pitch depends on your movement, just like when playing the drums live.
The pads section is ideal to trigger loops and samples, using your finger drum skills.
5.Has pressure sensitive pads
When pads respond to the amount of force applied after initial impact they are pressure-sensitive. The pads can be used to drum rhythmic elements of a song or to trigger samples, but can also be used to play notes.
6.Has an aftertouch keyboard
Aftertouch keyboards are sensitive to the pressure applied to keys after the initial impact, and while the keys are being held down or sustained.