Firstly - this is the public forum - we’re absolutely in the right thread for this exact discussion
The manual isn’t great wrt the grammar, it’s clumsy - but on this point it is actually correct - it just takes a bit of effort from the reader
LOCK will when activated make it possible for
the delay to function as repeater effect. If the FB
parameter of the DELAY MAIN page is set to 127,
setting SEND to 0 will repeat the content of the
delay buffer infinitely.
It tells you the prior condition FNB must already be 127
it then tells you that setting (i.e. ing, doing something) to zero will repeat the content of the buffer
the buffer has to have content to repeat - so to lock it from further content and to have pre-existing content to repeat it’s clear that you need to set the send to zero as the key action to freeze/lock the buffer which must have content
sure the manual could generally be much better in many regards (especially grammatically), but there’s no error there, you just have to use the info given together with some general audio insights
that’s why we encourage searching before posting - there’s nothing intrinsically new in this question (nor most OT queries), the echo freeze is a nuanced feature and it’s been discussed a lot (inc videos etc)
perhaps @eangman can review this point and tweak the manual accordingly