Hi Janine,
BE sure to us the "Search the Forum" option at the top of the screen. If you search for holosync in just the subject of the SFQ forum and set it for the past 4 years, you'll find this topic has been brought up a couple times.
We have a lot of friends/clients who have done Holosync for a long time, and they have many good things to say and show for their diligent practice.
My preference is to not mix Holosync while doing SFQ at the same time, since your brain pattern needs to be whatever it needs to be for the healing at the time, and the entrainment/modeling that's going on with the Holosync, may not be where it needs to go at that time, so instead it becomes a hurdle/distraction to bypass on the way to do what it needs to do.
If it's working for you-great. Go with it. If it's not, then revisit what each system recommends and adjust.
Much Love,
Shawn