DiMarzio combined the best qualities of the Virtual Vintage® Solo and Virtual Vintage® Solo Pro™ — high output and a full, warm sound — and pushed these qualities even further. Treble response is smoother, the lows are tighter, and there is more pick attack. Play hard, and the sound jumps out of the amp. Play softer, and the sound becomes cleaner and quieter. Naturally, there's no hum.