Steve
If they’re still around, check out the Casio Dg-20 guitar. I bought one on eBay about 3 years ago that works for about $22.00. It seems to resemble the Starlab but way less regarding cost. As a guitar player it will but a smile on your face. I have no idea how these slack nylon strings tune but the thing works fine. It’s like one of those things that you try it and get it out of your system. And for $20 bucks, you realize that even the greatest midi guitar is not something you’ll want to spend big money on. When the urge strikes again, it’s there in the corner waiting for you.
Just have your D batteries ready. 
yes, it can use a transformer too …check this out or search for yourself
Al