I was reading a review of the Akai Miniak which said
The 37 half-weighted keys are velocity and aftertouch but not pressure sensitive.
I thought aftertouch was MIDI signals of continuing pressure levels on a keyboard-key after the initial striking of the key?
I understand this is usually per-keyboard (max over all keys held down) rather than per-key.
Can someone explain the difference between "aftertouch" and "pressure-sensitive" in the review phrase? How can you have aftertouch without pressure-sensitivity?
The way I read it, the reviewer mentions three distinct attributes of the keyboard
- Velocity (sensitive) and
- Aftertouch (sensitive) but not
- Pressure sensitive
However, from Alex's answer and other subsequent research about MIDI messages, It seems that one of these three attributes must be just an alternative name for one of the others.
The Akai web page says it is velocity sensitive but makes no mention of aftertouch (or of pressure-sensitive).
So is this just an error in the review?
The Miniak manual says
- Aftertch: Polyphonic (per-note) Aftertouch, MIDI only
- Pressure: Monophonic (per-MIDI Channel) Aftertouch, MIDI only
So I guess the Miniak's keyboard is Velocity-sensitive (AKA pressure of initial impact) but does not have Aftertouch (sometimes AKA pressure-sensitivity post impact) but that you can plug into it's MIDI-In port an expensive MIDI keyboard controller that does has Aftertouch and the miniak's synth engine can use it.
I conclude the reviewer made a poor job of expressing this.