With the Keyblock you can now play MIDI notes directly with your Patchblock. You also get 4 additional knobs to control synthesis parameters with CC channels.
Combine with the Midiblock
If you combine a Keyblock, a Patchblock and a Midiblock you get a standalone Midi-Machine that can mangle your MIDI data from your Keyblock and send it to external equipment.
Mixing incoming MIDI
The Keyblock will always send on MIDI channel 1. If you connect a Midiblock to the left, you can still receive MIDI on other channels and forward it to your Patchblock.
Daisy chaining Keyblocks
Combing several Keyblocks together to get additional octaves and knobs. Continuous controller numbers as well as note numbers will automatically be down-shifted from Keyblocks connected leftwards.