Adding more keys to a midi keyboard

[the19thbear]

Hi. I might be getting a Yamaha KX25 keyboard/midicontroller, but i want to modify it to have 49 keys instead.
Isnt it just a matter of inserting a larger keyboard on the keyboard bus, and the unit will "see" all the new keys?

Thanks.

[richardc64]

It's highly unlikely that a modern device would use a single buss keyboard. The keyswitches are arranged in a matrix of rows and columns, usually n x 8, but sometimes half-octaves of n x 6 (+1 for the top or bottom key,) are used. Often, the matrix is shared with control panel switches/buttons and a microcontroller sorts out everything.

You might be able to attach a longer keyboard if Yamaha uses the same uC in longer keyboard models, but one can't count on that.

So sorry, no, substituting a longer keyboard won't be as simple as one would like. Nothing ever is.

[the19thbear]

meeeeehhhhhh.... well thanks