Percussion triangle trigger.
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Previously:
https://www.homemadetools.net/forum/...407#post185413
https://www.homemadetools.net/forum/...852#post167656
https://www.homemadetools.net/forum/...223#post180707
https://www.homemadetools.net/forum/...911#post167827
https://www.homemadetools.net/forum/...324#post215118