Larry,
You already done more than I asked for. I would even dare to ask to test this further. Thank you!

Jim,
Thank you for trying. Sonic has an option of handling / balancing things through multi-core. I tried from turning this multi core feature off to switching from 1-6 cores. No difference. CPU cores are not spiking. Nothing is spiking. Multi instances...sure I would love to use that if I did not have to lose a mixer channel to it smile

rharv,
Good thinking, but polyphony is not maxed. I am only using 4 midi channels. Actually 2 channels, layered. Not busy stuff at all. But I will try multi instance for testing purposes.

Guys, many of you genuinely tried to help. I think it is BIAB related, but Jazzmammal you might be right.. it might be one of those "dark, unknown things" smile Unless tech wants to get their hands dirty, I will just find alternatives to those synths/instruments (Sonic), and return to this with the next BIAB or a big Windows update.

Thank you.
Misha.