Calm Voices
Calm comes from pace more than from voice. Speed runs down to 0.5, and pauses come from punctuation rather than a parameter, so the script does as much work as the casting.

VOICES FOR THIS USE CASE
Speed is the actual control
Calm is more a function of pace than of voice. Speed runs from 0.5 to 2.0, and a setting around 0.8 changes the character of a read more than switching voices does. It is also the only delivery control available, since there is no tone or emotion parameter.
Selected by ear
There is no tone field in the catalog, so this set was chosen by listening rather than filtered. Treat it as a shortlist. The related tag, meditative, covers only two voices catalog wide, which is too thin to build a page on.
Punctuation as pacing
Without a pause parameter, gap length comes from punctuation. Full stops produce longer breaks than commas, and paragraph breaks longer still. For calming material the silence carries as much as the speech, which makes this a scripting decision rather than an audio one.
Does it survive a language switch
Speed transfers reliably across languages, so if 0.8 makes a read feel calm in English it will do the same in Hindi. Whether a specific voice sounds calm in a second language is not something the catalog records, so test each language you intend to ship.
SPECIFICATION
Sample rate
44.1 kHz native, resampled to 8 kHz for telephony
Latency
~200 ms to first byte (p50, warm region)
Output formats
ulaw, alaw, PCM 16-bit, WAV, MP3
Streaming transports
WebSocket, HTTP chunked transfer
Speed range
0.5× – 2.0×, set per request
Explore Voice Similar to
Calm Voices
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