Easy to use. Clean, classic design. Sounds great and is reasonably loud. Affordable. Thousands of sound presets, play-alongs, and tips inside the Positive Grid app. Only eight hours of battery life.

Spark Live could have been aimed squarely at electric guitar players, but Positive Grid wants to go further and offer a live and practice solution for bassists, vocalists and acoustic guitarists too.

The Positive Grid Spark 40 is a 40-watt modelling guitar amplifier that is just packed with all kinds of features. It has some 30 amp models and 40 onboard effects, and with its Smart Jam and Auto ...