“Ed was under the same pressure we all were. You can play your old gear, but it sounds old”: Billy Corgan on what drives guitar heroes to change their tone – and how it led him to package his sound in a pedal

The Smashing Pumpkins guitar icon reflects on a tonal journey four decades in the making, what pushes him to make signature gear like the new Laney Supergrace affordable, and why he’s the most excited he’s been to make a guitar album in 25 years