So after posting here, and sharing on Mastodon and Facebook, I drew a blank except for a helpful post from Rogue Amoeba (Audio Hijack's publisher) which I managed to miss for nearly a week because dice.camp by default doesn't show mastodon.social posts unless you are following someone (there are reasons for this, but that will get away from the tech discussion).
Ultimately, I was doing it wrong (yes, I know that, that's why I asked the question). The solution was in the support documents but I wasn't thinking in the right way. This was effectively recording a VOIP voice chat, and I'd not thought that through or read around the issue enough.
First error; using the Jabra conference speaker left me open to feedback and interference, so I switched to a headset.
The main fix was to change the set-up of the blocks to match those recommended for Voice Chat capture. The main feed from Discord when into a two channel Peak/RMS block and I had the microphone feed from my headset to the left channel, and the Discord output to the right channel.
The output from that block split into two parallel operations. The first took both channels into a mono-feed and then recorded it. The second operation filtered out the left channel - my headset microphone feed - and only fed the right channel (Discord output without my audio) into my headset.
End result was perfect audio, just in time for the final episode of the game.
Very much a case of RTFM.
Thank you to Rogue Amoeba for their gracious response when I saw their post and confessed that that I'd not read the support docs adequately!
15 November 2025
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