Here is my All In One PCB design with keyboard pullup resistors, to be etch at home.
Note : The double layer design v2.7 is better than this one !
v2.7 link : http://www.megadrum.info/forums/viewtopic.php?f=3&t=187
Schematic :
All pinouts are the same as v2.3 and v2.4 version.
Synthex