Is it possible to use other modes at the same time – scalar, contact, cold laser, PEMF, but presumably not plasma along with scalar?

Yes, we put Big Magic on the bed and set Scalar across several rooms, and the bed is right in the middle of the field, so we enjoy the scalar field and PEMF through big magic every night. We also run some contact treatments sometimes. But if we do biofeedback scan using GeneratorX, we would turn off the scalar.

For more details, please check the link:
https://www.facebook.com/groups/spooky2scalar/permalink/364988204074744/

It is not recommended to use plasma and scalar units together. I asked John White about that a while back. He advised me not to do so. The plasma field is much stronger than the scalar field, so it will be overwhelmed and have no function. The combined effects are largely unknown, so it is best to not use both simultaneously.

For more details, please check the link from:
https://www.spooky2.com/forums/viewtopic.php?f=97&t=10530