Sometimes the only way to find out if something was the cause of some odd occurence is to duplicate it. All things being considered though, it's highly unlikely the using of the chant and the Holosync at the same time would have a negative effect on you.
I have been combining some of the Qigong moving energy exercises with my daily Holosync practise for several months now, and I actually think they are very supportive of one another in that aspect for healing. Just today I did that, and found that after my Holosync session, I had a much better perspective and more energy available to move through some stuff I had been putting off for months. So it's not only a body energy thing, at least for me - it's also working with my mind to clear out blocks.
I realize that it has been advised to keep the two practises separate, however, for those of us who want the benefits of both and only have the time for one or the other, sometimes we must be inventive. The idea is to note what is or isn't working, and not become too fanatical about anything. At least that what works for me.
Sometimes we don't realize that we've hit a point where our bodies are just going to detox anyways, and who knows, maybe you were somewhat "inspired" to add the chant to assist in this, if this is how it appeared to you. I have noticed since starting to use Holosync, every few months or so my body goes through this detoxing type motion - I don't necessarily feel unwell, just a bit tired, and then my body clears itself out, and shortly thereafter I have energy to burn.
Just some words of encouragement from a fellow traveller on the road.
Cheers!
Unis