Hi.
A voice is made as waveforms (oscillators - elements)... I think the error is about number of waveforms used, which is not documented in YEM as a limit number... We know that maximum for a file (voice) is 8, but we don't know which is the max limit for all selected packs! The error, IMO, is strange!
It is possible that one of inserted voice to be wrong converted from Rex and add more than 8 waveforms?!
I don't think so, but everything is possible
In the final, I came with a question: Which means in this context (of given error message) "Waveform data"?! Elements or user wave files samples?!
Regards,
Vali