The new Heljan Class 25/3 presented an opportunity to add extra functionality to the model as part of a sound installation. MIKE WILD installs a ZIMO chip into the new ‘OO’ gauge model with sound from Digitrains.

Digital sound installations can be about more than just plugging in a decoder. The advanced nature of sound chips means they can provide extra functionality, but sometimes it takes lateral thinking to find the best way of exploiting those abilities. Heljan’s new ‘OO’ gauge model of the Class 25/3 is a good example.


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