Page 18 of the manual tells us why. The sample size limit restricts the number of cycles. One cycle is withing the limit. A correctly sampled cycle will loop just fine. However; Platinum does not seem to have the accuracy required for this level of work. It is limited to something larger. Even with all the parameters set to
sample or
real time it will not allow the precision, but jumps passed the zero crossing point.
That being said, is there anyone who is creating their own single cycle waves for use in the Z3Ta +2?