Today I have finished a (traditional) BLM 16x4 board and have confirmed it to be working. It uses duo LEDs and the very nice Marquardt 6245 series of buttons. Together with Wilba's MB-SEQ Control Surface and a TPC / BPM module it will fill the upper half of an abandoned Roland MV-8000 case. The board holds all necessary components including surface mount shift registers (DOUT and DIN) on the backside and connects via a single 10pin cable to J2 on Wilba's control surface board. Additional mo