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It can be done: External Transport Control I was researching how to mod the SQ-1 to respond to Start-Stop transport signals. There is a simple method with one NPN transistor and a 100k resistor which can be found in this Reddit post. Here is how the transistor-resistor circuit ended up looking: However, this mod is only reacting to the voltage high transition when pressing Start but won't react to voltage low transition when pressing the Stop button. On top of that the transp