The aftertouch does not transmit via midi. This is analog aftertouch. The strips are much nicer than any on the market, which we find to be too insensitive. These strips are made much better than the Rolands of the 80s and 90s, and should last for a long time. By the time these wear out, there will be even nicer sensors available. We don't just slap a sensor strip underneath the keys. There are actually little pads and multiple pieces of special types of felt used so that the response feels natural. I'm a performer and have used just about every controller under the sun, and I can say that our aftertouch is better than any of the others I have played. The reason for this is that we use a high quality sensor, and that we hand build and calibrate each keybed that we set up. You won't get great response from the standard AT strip that Fatar and others use. It's too cheap and requires too much downward force. Also the response curve is more like a step function than a linear sweep.