As it got mentioned in the development blog:
Here is a first look at the MIDI driver. Each instance (up to 4) of the ES MIDI module creates 8 ports in the MIDI driver. The output ports should be connected to the Expert Sleepers 8GT module. It is essentially the same as “CV to MIDI” but this way you can send any MIDI message using the existing modules. For debugging porposes I created a specialized scope to review the bits of the encoded MIDI messages.
If you like further information on the Expert Sleepers hardware modules and using an audio signal for sending MIDI in Rack should check out this video: