As he's already learning and practicing piano scores at level 5, he's not going to like to create bleeps and weird noises for a very long time ...He's clearly going to enjoy making weird noises more than knowing about signal flow.
And also, even though he had extremely limited screen time for the first 6 years of his life
( I know : I'm a mean dad that has forbidden his son to spend hours drooling in front of a screen
) he's been fiddling already with synthesizers presets and making zaps, burps and the like ...For the moment, his favourite synth GUI is ACE from u-he.
... so he started attending music schools when he was 4, first in those kids classes ( he had a lot of fun and wanted the classes to be every day ) ... then he started learning the piano ( classical, in an academy ) when he was 6 ... and now he's 10, he jumped from level 3 to level 5 in piano ( at the request of his piano teacher ) and he's a huge fan of the work of Kraftwerk, Vangelis, Vince Clark, Depeche Mode, Brian Eno, Rammstein, etc ... ( on top of the usual Bach, Mozart, Chopin, Litsz, Rachmaninov, etc ).
, because they sound fantastic, and sound is everything--and you can do a lot with either of them. However, you may want to also consider getting something that he won't grow out of too easily--such as Diva. I know there will be some that will question how I could possibly recommend Diva--just look at all of those knobs!! SCARY!! Well, the truth of it is, that it is essentially an oscillator section, a filter section, envelope, etc.... Just like everything else. It just has swappable options to allow for more diversity. This kid really sounds like he'd be able to do it with no problem. Diva even comes with template presets that prepatch all of the important parts to make a Jupiter 8, Juno, Korg MS-20, etc, etc..You would still be doing basic subtractive synthesis, but would have a lot more room for growth.
