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Substitution rules contain lists of “target:replacement” mappings, which enable you to correct consistent and frequent transcription errors that result from out-of-vocabulary words, excess noise in the audio, poor enunciation, or strong accents. They can also be used to correct word combinations that rarely occur in general speech but occur frequently within a specific domain or company.

For example, useful substitutions in the insurance domain could include “giant whale : giant hail” and “hit a beer : hit a deer”.

Table 1. Substitutions Parameters






V‑Blaze 7.1+

V‑Cloud 1.6+

true, false (default), none

The subst parameter can be used to enable or disable automatic system- and model-level substitutions.


Enables system- and model-level substitutions


Disables system-level substitutions; model-level substitutions still apply


Disables both system- and model-level substitutions


subst does not affect substitutions requested with the subst_list or subst_rules parameters.

This parameter is intended for debugging purposes only and should not be used in production.


V‑Blaze 7.1+

V‑Cloud 1.6+

true, false (default)

Provides substitution details in JSON transcripts.

Set substinfo to true to include a top-level JSON object that indicates the applied substitution rules and a number count for each rule.

In addition to the top-level JSON object, substinfo includes another JSON object in the metadata that details each substitution's location, the substitution rule applied, and the substitution rule source.

This parameter is intended for debugging purposes only and should not be used in production.


The information provided by the substinfo parameter is especially helpful for developing and debugging substitution configurations.


V‑Cloud, V‑Blaze v5.6+, V‑Spark


Specifies a newline-delimited string that contains substitution rules to be applied during transcription. Rules can be specified directly as a string, however, the recommended approach is to auto-populate the string with the contents of a local substitution file into the subst_rules field by using the < operator. This approach makes it easier to edit and maintain these rules over time.

Use the subst_rules parameter as shown in the example below.