HowCurio original one-channel audio exercise — 14 October 2026
Synthetic440Hz pulses, 4seconds, 24000samples/second, 16-bit PCM. No speech, music or private recording. Set your device to low volume before playing.

left-only.wav: stereo,384044bytes. Left channel has pulses; every right-channel sample is zero.
kept-channel-mono.wav: mono,192044bytes. Its96000 samples match the original left-channel96000 samples bit-for-bit.

Import left-only.wav into Audacity. Compare the two waveforms. Use the center-mono split command for your version and delete only the empty channel. Export a new mono WAV and open it again. The expected useful structure is one waveform, one channel and four seconds. These supplied files were constructed as PCM specimens and checked with ffprobe/sample comparisons; they are not Audacity exports or a headphones test. A mono file normally plays through both speakers when centered. Original material is free to use/adapt.