Reference: #1714

Customer had an issue where text-to-speech has been cutting out on Web Chat. To quote the conclusion:

So when the "additional questions" type message gets into the channel it interrupts the reading task to focus on the new task.
A workaround for now is to stop using "additional questions" type messages.
On the other hand it would be great if the webchat.js could queue messages to read in queued fashion.

(emphasis mine)

Queuing messages would prevent the bot from 'cutting out' and interrupting whatever current utterance is being made. Is queuing messages to prevent interruption of speech something we want to support in the near future? @compulim in particular has done the most work with Speech recently and may have thoughts on the matter.