Does it work if you use ffmpeg to feed it audio from a file? I personally would try file->ffmpeg->voxtral then mic->ffmpeg->file, and then try to glue together mic->ffmpeg->voxtral.
(But take with grain of salt; I haven't tried yet)
Oh, that's interesting. The readme talks about GPU acceleration on Apple Silicon and I didn't see anything explicit for other platforms, so I assumed it needs GPU everywhere, but it does BLAS acceleration which a web search seems to agree is just a CPU optimized math library. That's great; should really increase the places where it's useful:)
(But take with grain of salt; I haven't tried yet)