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Adding more keys to a midi keyboard
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Tue Jul 30, 2013 3:54 am    Post subject: Adding more keys to a midi keyboard Reply with quote  Mark this post and the followings unread

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.
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richardc64



Joined: Jun 01, 2006
Posts: 609
Location: NYC
Audio files: 25

PostPosted: Tue Jul 30, 2013 5:24 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

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Last edited by richardc64 on Tue Jul 30, 2013 7:21 am; edited 1 time in total
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Tue Jul 30, 2013 5:40 am    Post subject: Reply with quote  Mark this post and the followings unread

meeeeehhhhhh.... well thanks Smile
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