This can occur when the MIDI readahead time is too low and events get
pushed into the MidiRingBuffer after the corresponding read. In this
case, skip_to() gets called (as it does before every read) and the
events are silently dropped.
This is a Very Bad Thing(TM), so warn about it. I am not sure which
other scenarios can skip events that aren't problematic, but there's
probably some. A more sophisticated detection/reporting (or maybe even
dynamic reconfiguration) scheme would be nice here, but some false
positive messages are at least better than silently failing to play
notes and the like.
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