The other thing about Locosound engines is that they have speed control. The sounds are very rudimentary and amount to synthesized facsimiles of a bell, whistle/horn, and steam chuff/diesel prime mover sounds. Compared to PS1 or PS2 sounds, they're terrible. However, since they have speed control, Locosound engines run as slow and smoothly as a PS2 engine. They also have fan-driven smoke units. No command control, though.
Locosound came out as a low-cost, conventional-only alternative to PS2. If I recall correctly, the Locosound boards use the same plugs/connectors as the PS2 boards, and the speed control electronics, as well as the smoke units, are identical to those found in PS2 engines. Thus, upgrading a Locosound engine to full PS2 sound and command control is much easier than doing an upgrade from scratch.
