There are great guitar effects apps for iOS, apps which take the signal from your electric guitar and process it with weird and/or great-sounding effects. And there are also several Bluetooth gadgets ...

You don't need a pedal, or even a guitar, to make amazing music with a looper app. Photo: Charlie Sorrel/Cult of Mac A looper is a great musician’s tool, for practice and for making songs. Looper apps ...