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not sure if this helps (because i am very new to this) but this is taken from my music creation guide:
aftertouch
Most of the serious controller keyboards include a controller known as aftertouch, which uses a pressure-sensitive strip under the keyboard to sense how hard you press down on the keys after the initial velocity has been read and converts this to MIDI data. Aftertouch sends out lots of MIDI data, so it’s best to switch it off if you don’t want to use it. If you do use it, however, it can be used to control various aspects of musical expression, such as brightness, loudness and vibrato depth.
Conventional aftertouch affects all of the notes that are playing at one time, not just the one you’re pressing down, although a few specialised instruments feature polyphonic aftertouch, where the data sent applies only to the note being pressed. Polyphonic aftertouch (sometimes referred to as key or channel aftertouch) can generate a huge amount of MIDI data, and so it must be used with care.
Another feature found only on specialist keyboards is release velocity. All velocity-sensitive instruments generate MIDI note velocity, depending on how quickly you push down the keys, but on an instrument with release velocity, additional information is generated depending on how quickly you release the keys. Very few keyboards offer this facility, however, and even fewer musicians know how to use it creatively!
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