Well since we're talking about playing position and such...although you can play the LinnStrument standing up like a guitar (there are included guitar strap pins), I found treating it as a tabletop device and laying it on a surface more friendly. Then again I never really got along with playing strap-on keyboards, so I guess that’s not too surprising. Playing with one hand works for solos, but two-handed technique is definitely a better way to exploit what the LinnStrument can do.
Make no mistake: this requires new muscle memory. Although laid out like a guitar, guitar technique won’t do you much good unless you’re into tapping; keyboardists need to think in terms of shapes and intervals, like a guitarist. Physically, the LinnStrument is easy to play. Mentally, it’s a new instrument and it takes time to develop the kind of unique physical dexterity needed by any musical instrument. I don’t want to make it sound tougher than it is - it's definitely intuitive - but I don’t want to make it sound easier, either.
For a guitarist, the LinnStrument is a mix of guitar thinking and keyboard technique. For a keyboard player, the technique will serve you well, but you’ll need to start thinking in two dimensions instead of linearly. If you’re not into “new and different,” this could be a confusing juxtaposition. But if you find the LinnStrument intriguing and play guitar or keyboard, think of yourself as already being halfway there—it’s just a different half, depending on your instrument.
As to why Roger didn’t use a piano note layout, for an overview go to http://www.rogerlinndesign.com/linnstrument.html
and scroll down to the heading “How Are the Notes Arranged?” There’s also an in-depth explanation at http://www.rogerlinndesign.com/piano-vs.-grid.html
, along with links to videos that show playing techniques. If you’re not convinced the grid approach makes sense, after reading this material you’ll see why it’s a logical and intelligent choice.