Specs:

4x MIDI IN and 4x MIDI Out with USB2.0

The Software/Firmware is from ploytec and used in many commercial products.

PCB and Preprogrammed chip is available from me - send me a Email (15Euro plus shipping 6.60Euro)

(The costs what I paid for) - Not commercial sale.

BOM:

Partlist

https://docs.google.com/spreadsheets/d/1u6wgABhqt0vknTZJFNVShALNdmQvRK_okAad-lOCuyc/edit#gid=0