An astonishing amount of clever processing goes into persuading a single 6.5” driver to produce such volume and depth from this lightweight package. But if it’s important to be able to play along to backing tracks, you need to be aware that none of that clever processing is applied to the aux-input, which consequently sounds really strangled. More important, I didn’t find it easy to achieve a clean ‘acoustic’ sound from my electric upright bass. You will say I should have bought something less sophisticated without smart-arse modelling and a phone app. Indeed. And that’s what I’m going to do.