I would love to see vacuum tubes integrated into this app. I build electric guitar amplifiers and if a guitar amp is of any quality then it has tubes in it. This would be a great tool for me when I am protoyping a new amp design. However I can't use it because it doesn't have tubes incorporated into it, Which are essential. Main tubes that are used are 6V6, 6L6, EL84 EL34, 12Ax7, 12AT7, 6550, ECC83, 5881, KT66, 5Y3