Hi Mark.
I just made a small video about these hung notes. It happen with the use of the stop pad of the pyramid. I can stop it by pressing a lot of keys. In this video, there is no sequencer module at all, only a s-basicpoly as first module in a 1x10 configuration. But it also happen in my usual 4x2 setup. I disconected the organelle midi out/ pyramid midi in for avoiding midi loop.
https://www.youtube.com/watch?v=XnwCj_EEeQ0&index=1&list=UUMm0F2ZZ7Er_5Wq1z58V2Ww
My solution so far is to use empty sequences instead of the stop button. This way, notes are correctly turned off.
It doesn’t seems to happen with non-orac patches, I did a test in the same condition with a basicpoly patch
https://www.youtube.com/watch?v=QJkAgDI1D6Q&t=0s&list=UUMm0F2ZZ7Er_5Wq1z58V2Ww&index=2
I guess I can learn to avoid pressing the stop button!