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Hi all. I have a PC4 88 key. First Kurzweil owned. Have Owned Roland and play Motif at church. (We also have a Nord Stage 3 but it sounds cheezy t...

@luigi I actually have the same problem. I found your post by googling "known Kurzweil PC4 problems" and arrived here. You described it perfectly....

@hipogrito I noticed the same "Chorusing" problem. The main Dyn 9ft Grand starts out fine. After a little while the sound changes adding that sligh...