Lesson
How the student performs a lesson relative to the reference: together with it (SINGALONG) or echoing each phrase after hearing it (SINGAFTER).
This is the lesson-level authority. Session behavior — the LISTENING→SINGING phase machine and reference-time mapping — keys on it, never on per-segment field sniffing. Segments carry the timing (the student-response windows); the lesson type says what that timing means.
Clients with richer catalog taxonomies collapse them to these two behaviors (e.g. singafter_meter_minus → SINGAFTER).
Properties
Inherited properties
Functions
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.