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Here is a ring buffer variant to test also



/* Control a set of solenoids with MIDI
* Note on messages trigger solenoids, and they will be turned off after a certain amount of ms has passed
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Its not my project, but I agree that this a could be a good way to handle something like 100 solenoids, a number to big for the Teensy pincounts. In this case there would be a solenoid array, or...

I have tested your original code on a Teensy 3.6 and a virtual midi keyboard on MacOS, outputs just connected to led's. With only these 5 possible solenoids its very fast, in order of ten...

With all delays equal and the time always monotonically increasing its a simple queue, I would use a circular buffer with the reference (pointer) to the head which is the next element to remove, and...