By the sound of it, the problem most likely lies with voxinup.
On Sat, 10 Jul 2021, Chime Hart wrote:
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Wow, after practicly an entire afternoon, we got Alicin-and-Samantha
installed in Debian on my laptop. We needed to run "voxinup" instead of
speechd-up. Voice sounds quite good, was about to explore dictionary
settings, when I realized no keys, controll or anything else will interrupt
speech. I must wait til it stops reading or catches up if you type while its
reading. I have no idea if there are any places in Speakup where I can fix
this, or would I report this through Oralux? Thanks so much in advance
Chime