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Proto-Sound 3.0 Upgrade Program To Replace Proto-Sound 2.0 Program
FS: MTH QSI Proto-Sound 1 Boards | O Gauge Railroading On Line Forum
FS: MTH QSI Proto-Sound 1 Boards | O Gauge Railroading On Line Forum
MTH Proto Sound 1 - Using Alkaline vs. MTH 8.4v Rechargeable | O Gauge
MTH Proto Sound 1 - Using Alkaline vs. MTH 8.4v Rechargeable | O Gauge
MTH Proto Sound PRR 4-4-4-4 T1 Duplex - YouTube
Protosound Boards
How To Do A Speaker Upgrade on Original MTH Protosound Engines - YouTube