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.
A synth-action keyboard feels more like an electronic organ. The spring-loaded keys are light and capable of being moved very quickly. They also tend to return to their resting position much more quickly. Synth-action keys are perfect for musicians who aren’t pianists by nature, such as guitarists wanting to add MIDI functionality to their setup.
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.