Just bought my second Spec Backmann steam engine. This one is a  Heavy Mountain.  I want to add sound to it.  It comes with a Vandy tender.  I could use the soundtraxx 750 or the digtrax SDN144PS.  Being retired and on a fixed income i have to watch my funds given the cost diff between the two.   However I will listen to advice from folks who have done this before.  Open to suggestions.

By the way will a vandy tender for a H4 2-6-6-2 work with the light mountain or the heavy?