Might be worth trying to determine if it is only certain BD machine(s) or if all/multiple types are affected, for example it could be to do with the way the sound is configured, this kind of issue can sometimes occur in sounds which rely on an impulse to excite a self oscillating filter, if the oscillation decays completely away sometimes it needs to be ‘jump started’ again. Once the impulse is sent through the filter a few times it brings it back into oscillation, so it could be that the act of tapping the pad again is enough to re-initiate the oscillation and therefore make the BD audible again.
Note: I don’t know if this method is used in any of the AR BD machines but it could be worth finding out, or it could be of a similar nature, just a theory but possibly a starting point in troubleshooting it.
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