Hi Both,
Yes I hear the same as KitKat and the same again at Bb to B. I had noticed this before and I assume it is just the 'stretching' of the sample (try it an octave lower Bill). The KN7000 has very little memory and I would think that the technology of the time only allowed for speeding up and slowing down the sample a few places over the range in order to get the variation in pitch. C to Dd is a pretty good place to have a break in the sample as is Bb to B. It would be extremely annoying to most players if the break was at B to C or E to F.
This would only exhibit in an instrument that was recorded with vibrato rather than one where an electronic vibrato effect was applied.
This particular trumpet, I would say, would have been very challenging to program at the time with such little memory to work with.
Regards,
Mike