In this set of videos, synthesist Rüdiger Gaenslen demos his custom Prophet 5, which has been modified to have a keyboard with aftertouch.
In the second video, Gaenslen demos some of his custom patches on the Prophet 5 with aftertouch:
Sequential Circuits Prophet 5 Rev. 3 with Fatar Keyboard and Aftertouch-Mod by Synthtaste, Bochum, Germany, Martin Höwner. This Prophet also got a new ans secure PSU without any noise.
Audio recorded mono directly, without any effects, mastering, eq, etc.