Yep, for sure I'd replace the AC regulator and the smoke resistor. You can't put track voltage on that smoke unit resistor directly, a 6 ohm resistor with 12 VAC on it would dissipate 24 watts, over three times the maximum it should ever see. You'll get some amazing smoke, but not for long!
Truthfully, I suspect the sounds are still intact, it looks like the damage was the regulator and associated wiring.