Hi! I am about buying an used Sans Amp Bass Driver DI in order to get a more "tube-like" sound from my Music Man HD-500. Do you think it's a good idea using that as a pre and linking it directly to my amp? Are there other ways to do that, with other preamps or stompboxes? The one I found is the first model, the one with inside settings. Except for the on-off switch (which is only on the second model), does anyone know if there are other differences? Thank you very much... Excuse me for my english!