I am working on a harmonic table midi keyboard inspired by http://wiki.lvl1.org/Isomorphic_Keyboard
This will be a grid of 21x12 keys with two switches per key. Two sets of matrix switches, one upper PCB and one Lower PCB to.determine velocity.
I was concerned about scanning two large matrices, but the keys repeat along its length,
By duplicating the lines in, the 21x12 matrix can be reduced to 7x12. This should hopefully reduce the total matrix scanning time with only sacrificing the option to designate keyboard sections to different channels.
Are there any problems to this approach?
Regarding resistors, do I need any on the lines in/out and if so should they be before the line split or after?
Thank you for the help.