I used the keyboard it self with LMMS to map out the keys, into two different instruments in LMMS.
Similar to mapping controls from the keyboard to LMMS, but a little more complicated.

I often do my writing of music in three steps. 1. the hand written copy. 2. I use a music editor, one of 2 that I use both have their strengths, and weaknesses. Depends on the complexity of the music that I'm writing on which that I use. Play back the music, and edit notes from the editor. Print the...

I'm not good on explaining how I did it. I split the keyboard at middle C into two different channels, But I have found the playback sounds like your sitting in front of the keyboard.
Here is a sample.
https://soundcloud.com/eino1953/beethov ... piano-solo

I'm new to the forum, but I have been using LMMS for a little over a year now.
Great work guys, and gals. My hats off to the developers.