Has anyone worked with these pedals when trying to get a warm tube type sound? Possibly trying to warm up a new EA iAMP 800. Sounds good but it does not have tube warmth to it. They make a nice amp and can't say many bad things about it. But Digital means "No Tube". But I thought maybe someone has used a pedal such as these with success. More than likely Im selling it but maybe someone has worked with a pedal or something.