The Jamup was my introduction to the world of iOS guitar amp sims and the AC30 model was the centre-piece of that superb free version of Jamup that all of us have played at some point.

And it is fantastic, rich and full-sounding and goes all the way from sparkley clean to ferocious monster. I’m not sure how authentic it is – Tonestack has the advantage there – but it is a hugely versatile model and enormous fun to play, it also works very well with modeled effects.