Hello, again: Following up on my previous post, I now have a questions about how to up hook my keybed. My keybed was manufactured by Fatar around 1993 (it is out of an old Peavey DPM 488 synthesizer). It has 88 keys with normally-closed and normally-open contacts. The interface is a 40-pin cable with lines labeled (per Peavey schematics): RET0..RET7, SENDT0..SENDT10, SENDB0..SENDB10 and the rest of the 40 pins not connected. I have attached a schematic. Because my keybed is not the more contemporary Fatar DR or DF style contacts, it is not separated into "left" and "right" portions, and because it has 88 keys, none of the examples I see on the www.ucapps.de web site seem to apply. Questions: 1) Do I have enough I/O ports with only one MBHP_DIO_MATRIX module? 2) Given the right number of MBHP_DIO_MATRIX modules, how do these 30 "signal" lines from the keybed connect to the MBHP_DIO_MATRIX? I am presently collecting all of the parts to build an MBHP_CORE_LPC17 and one MBHP_DIO_MATRIX module. Thank you in advance for helping me. Rick