Hi Mr. Smith, yes the artifact that i noticed became present to my ears especially when I closed the filter on any sound to make bass sounds, even with the low pass filter closed it would not filter out this very high pitched almost ringy type sound. To get rid of the artifact I had to put an EQ in the instrument track in my DAW and close a high shelf EQ down to about 9-10khz and that would get rid of the artifact but that also kills any air in the sound so that completely is unacceptable and sucks!
I posted a sound example in another thread here in the Prophet 12 forum, check the sound examples out I posted in the other thread and let me know if it’s the same sounding artifact you’re experiencing.
I just had to take out the main voice board and ship it to Sequential for repair, they were great, had it back to me in less than a month! Completely fixed it.