🤱 Apps — the MamaTalk story
MamaTalk is the one app of our four that is not about speed. It runs on the same engine as the others and points it the other way — nothing is sped up and nothing is shaved off. What follows is a description of materials: what it plays, and in what sound. It does not say what any of that does for anyone, because that part is not ours to say.
Streaming services thin audio down to save data, and for most listening that is a reasonable trade. This app does not make it: the 44.1kHz WAV leaves the server exactly as it was recorded. That is the whole reason a single ten-minute episode runs over 100MB, and why we suggest listening on Wi-Fi. Music platforms now charge extra for a lossless tier, which says plainly enough what the industry thinks the difference is worth — here it is not an upgrade, it is simply where we started. What compression actually removes, and why it is hard to catch on a first listen, is set out in [[mp3-problems]] and [[why-wav-becomes-mp3]].
The music underneath is jeongak: the slow, even-breathing court and scholars’ music of Korea, taken from the open archive of the National Gugak Center. Folk tales and classics of world literature are read in English over it, and on screen the mother’s reading and the father’s lines are marked apart. There is also a mode that plays the performance alone, with no story at all. And one track is not aimed at the baby: gentle water, set for 10, 20 or 30 minutes, which stops on its own and steps aside the moment a story is opened. That one is for the person doing the playing.
Before an episode starts you choose the listener — prenatal, under five, children, adults or seniors. The high bands that should not reach a foetus or an infant are switched off on the server rather than in the player, so what reaches the phone is already tuned. The court music behind the story is left untouched. On the screen, ten ink-wash illustrations turn with the story and Korean and English subtitles change with the scene, so it reads like a picture book while it plays.
Everything above is a description of materials — what is played, at what sample rate, with which bands switched off. What any of it does for a foetus or for a child is not written here, and not out of modesty: we have no measurement of our own, and the published work on prenatal listening is not settled enough for an app to lean on it. Prenatal music is a custom long before it is anything else, and different cultures keep it differently. What we can be held to is the sound itself — uncompressed, unhurried, and honest about where it came from. The rest is the parents’ judgement, and we would rather leave it there than sell it.
One episode is a better introduction than any description of it.
Source
Adapted from MamaTalk’s own product material and from Oh Seung-jong, The 30-Day Wave Speed-Listening Miracle (2026). The court music is performance audio from the open archive of the National Gugak Center. On what compression takes out of a recording see [[mp3-problems]] and [[lossless-audio-guide]]; for a test you can run on your own ears in half a minute, [[lossless-30sec-check]]. — Carried over unchanged from the Korean edition: the point at which it stops. No claim is made here, as none is made there, about any effect on a foetus, an infant or a child. On why sound has no quality standard the way water and air do, see [[sound-purifier]].
Read the original →※ This article summarizes and restructures the key points of the source above.
🎧 Lossless audio · 10 more on this