@marioguzman I absolutely LOVE this software from Pianoteq (physical modeling synthesizer). Look what happens as you drag the "condition" slider at the bottom of the window from "Mint" to "Worn". The sound of the instrument changes from a beautifully kept classical instrument to the guitar you found at a yard sale that barely plays. It visually *shows* you what sound you should expect. I really miss this kind of clever design. (Look at how yellow the piano keys get!)