I don't recall if this has been discussed before, so I'll mention it here. You can use your voice to trigger Keyboard Maestro macros. I do it every day to trigger some of my macros. Here's an example. I have a simple/free App Store game called Pool and I can trigger it by creating a small Automator script which is triggered by the macOS dictation assistant. Here's what the Automator script looks like:
(Actually I don't have a macro in KM called "Play Pool", I just typed this in as an example. Hopefully I made no typos.)
To make this work you have to have macOS dictation enabled, which is in the "System Preferences" and looks like this:
From there if you click on "Dictation Commands" make sure you have the checkbox called "Enable Advanced Commands" checked. I am omitting that screenshot from this message but you can easily find it.
As you can see able, you have to say "Computer" before you speak, but if you uncheck that box you can even avoid saying that word. (a macOS voice recognition popup box stays on the screen then, which I find annoying, so I say the keyword "Computer" instead.)
Another relevant window to get this to work is the System Preferences / Keyboard / Dictation window. As shown here:
I turned on the Enhanced Dictation (which downloads a huge file from Apple in order to do voice recognition locally. I'm not sure if it's a requirement for all this to work. I downloaded it years ago and haven't gone back.)
About once a day macOS gets quite badly stuck on voice recognition and it seems to require a reboot. Sometimes it can be resolved by turning dictation off and on, but sometimes a reboot is required. There are discussions about this issue online but I don't think anyone has a perfect solution for this yet. I could give tips on this problem in a follow up post if anyone is interested.
The macOS voice recognition is good quality, but not as good as SIRI. I'd estimate it interprets me correctly about 95% of the time.
Naturally I'm hoping that some future version of KM can hook into macOS so a voice command can be used to trigger a KM macro. This might be difficult for Peter to implement, but it seems in keeping with the philosophy of KM to make simple ways to trigger sophisticated macros, like the recently implemented trackpad gesture triggers.