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Here is demo link that you can use for that purpose. https://demo.2hz.ai/

We are also building web and iOS apps to cancel the noise in the files.

Nice, it's especially notable for loud noise (which otherwise triggers voice activation) while not talking

Cool! I thought I had a test recording for this, but (un?)fortunately, my workplace sprung for a fancy directional mic that already did a very good job of isolating the speaker's voice.

I still plan to play with the app for voice chat, though.

They have an API: https://2hz.ai/api/index.html

You have to apply for it and it's apparently priced per minute. I applied and I'm waiting for pricing info.

Sure you can. I don't think anybody can stop you doing that. You just need 2 computers. On one you play the clip. On the other you record it. The remove the audio from the video and put the new audio onto it.

Yes, of course I can run my audio file through it by actually playing it and recording the result, but I'm asking if there's a version of this tool that takes an input file and writes to an output file on its own.