Can anyone recommend a good synth that will be fun to play with but not too confusing for 3–5 year old kids? (With adult helpers who have some basic piano experience but don’t know much about synths.)
https://www.youtube.com/watch?v=1s98te0b4bo
From a more music-oriented perspective, I might suggest the Casio SA-77 - it's a whole bunch of fun for $50.
https://www.amazon.com/Casio-SA76-mini-Sized-Tones/dp/B00Q83...
Does it get any more interesting if you hook it up to an external midi input like a keyboard or sequencer?
The Casio SA77 doesn’t seem to have any Midi out, so it couldn’t e.g. be combined with the blipblox.
No keyboard but it’s a blast.