Help with redstone signal and command

[Undefinyx1]

I want to make my speaker play an audio file after recieving a redstone input (the os.PullEvent("redstone") thingy).
Anybody know how?

[SquidDev]

Firstly, it sounds like you've figured out how to wait for a redstone input, but just in case, I normally do it by looping until redstone.getInput is true:

-- Wait for a redstone signal on the left
while not redstone.getInput("left") do
  os.pullEvent("redstone")
end

As to playing an audio file, there's several options. The easiest is to use shell.run to execute the speaker command:

shell.run("speaker play my_audio_file.dfpwm")

Alternatively, you can call playAudio directly. The example in the docs is probably a good reference for that.