I didn't really offer much in the way of explanation about my post above for shortness of time. So to clarify a bit...
An entrainment track; any entrainment track, regardless of the manufacturer, has only one purpose and that's to coax the brainwaves to fall into line with those on the track. Regardless of marketing claims of various products to the contrary, there's no such thing as a track that cures this, that or the other thing, or one that contains a magic frequency that specifically makes Qi flow or meditates you, etc.
All due respect to Mr. Harris (founder of CenterPointe Institute that produces Holosync products,) claims for condition or purpose-specific frequencies are almost universally just marketing gimmicks.
The slower the primary brainwave frequency your brain is producing, the less voluntary control you have of circumstances in the world outside your head. Most theta and delta brainwaves are experienced during periods of sleep, which is something of an indicator as to how the body utilizes them. A person could train themselves over time to enter those states and probably still be active in the outside world but getting to the place where that's a possiblity is likely somewhere down the road for most of us.
Anyone wanting to try entrainment to augment Qigong practice would be wise to use a product that targets a single alpha level brainwave frequency. Alpha waves are predominant when the both mind and body are relaxed, but alpha is still close enough to normal, waking beta waves so that a fair degree of conscious control exists.
For Qigong practice that's perfect, especially for forms that involve physical movement. You're still consciously aware enough that you can move through your forms with precision, yet relaxed enough that thought slows down and is less distracting so your awareness of Qi flow is enhanced. It's sort of a balancing act I suppose.
In the series I use there are several tracks set to a pure alpha frequency so that ends up working well. They certainly don't "cause" Qi flow per se, but Qi seems to flow more naturally in a body and mind that are relaxed and those alpha waves seem to do just the trick. I suspect any track you use could enhance Qigong practice as long as it consistently promotes a light state of alpha waves in the brain. Probably even just white noise, nature sounds, or amelodic music like Zen meditation music, shakuhachi or Native American flute, Tibetan singing bowls, and so forth would also promote relaxation and Qi flow.