I opened a separated forum section for discussions about the MIDIbox BLM, since this project is not tightly coupled with the MIDIbox SEQ project, but can also be used standalone.   Schematics:   mbhp_blm_scalar.pdf the "BLM_SCALAR" module mbhp_blm_scalar_module_interconnections.pdf interconnection diagram. 5 x BLM_SCALAR modules are required for a complete BLM16x16+X