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Possibly but money wise buying a legacy engine would be a much better choice. chief
Lionel doesn't sell Legacy boards, only TMCC ones. cheif is right, your much better off buying a Legacy locomotive. If your really attached to the sd70ace, why not upgrade it too PS2?
I'd be pretty happy if I could even get RailSounds 5 boards with the better audio, but so far Lionel only sells TMCC/RS4 for upgrades. This is one reason I started moving over to MTH, there is a better variety of sound packages for PS2 stuff.
What is your problem with the current sounds, just like the Legacy better? FWIW, I think the Legacy stuff has the best sound currently, so I wouldn't be surprised if you have come to the same conclusion.
I also hate to pick nits here but "upgrading an engine to Legacy" means buying a different engine. Unless something recent has happened, Lionel does not offer Legacy upgrade boards.