Morse could work, semaphore, but- passing a story on one letter at a time, without the listener writing it down-

[ Sypha might be able to, but neither of them could. It would be asking a lot even from her. It's difficult. There are solutions, but all of them involve doing this one letter at a time. For a whole story, that just doesn't seem practical. ]

But- that bullshit you just said- [ He understood 'sound system', and that's it. But it's enough to think on. ] -Sypha, does a recording count as writing something down?