While it's good fun to jam out on the guitar with a powerful amp, unless you have a soundproof room or live on your own out in the boonies, you might find it hard to practice without annoying ...

The Spark 2 from Positive Grid looks like a miniature old-school amp, but it is, essentially, a computer with some knobs and a speaker. It has Bluetooth, USB-C, and an associated smartphone app. It ...