Sample Pad 4 external pedal triggers

Is it possible to connect two pedals to the Sample Pad 4? The instructions aren't clear on that, they talk about "dual triggers." Since there's only ONE TRS input, does it mean I can connect a hi-hat pedal and a bass drum pedal at the same time via an adapter with two TS for the separate pedals into one TRS? And what Alesis pedals could I use? Would the "real" hi-hat pedal work or do I have to buy two DM pedals? Thanks for your much needed clarifications.
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