Qestion to Mr. Bach Man on Spectrum Steam with sound

[Pacific Northern]

Mr. Bach Man would you please confirm if the factory sound equipped steam engines have always had the same series of sound decoders from Soundtraxx with the Tsunami technology?

If Bachmann has used more than one series of sound chips in their factory equipped steam engines how can a purchaser tell which decoder series they are purchasing.?

[the Bach-man]

Dear PN,
As far as  I know, the decoders have been consistent from the beginning.
Have fun!
the Bach-man