Those "convulsions" sound normal. IME when my body comes in contact with "DMT energy" there is involuntary, autonomous movement. It can happen to the rhythm of the experience if there is basically an onslaught of energy, or if music is playing, particularly one with a groove, it can modify the energies in such a way that there becomes rhythmic oscillations of the body in a psychic-transduction kind of way.

For me, the whole DMT experience is very energy based. Everything I perceive within the experience from the entities to the landscape and everything in between is made up of this energy. When it comes in contact with the body, it can create involuntary, guided motions. The music has a synesthetic affect on the energy, thereby moving, reshaping and modifying it, and so especially if I'm listening to music that has a groove to it, this will result in synchronized involuntary oscillations in the head or limbs. From what I can tell, this energy is affected by light and sound (vibration) attention and breathing. It was through the use of music that I first discovered this energy as well, but as I said, I've come to see it as the basis for the most part of the entire experience. I have learned to conjure and interact with this energy during meditation and other times of the day (sometimes when least expected). There is much to be said about this energy, but I'll stop here for now

After my second white light encounter with the godhead, I had just gotten through the final white light phase of the closed-eye experience, and opened my eyes. Now, I'm familiar with all sorts of involuntary movements from DMT, but this was rather unique. It was like some internal, instinctive, automated programming was causing me to roar like a lion, head involuntarily rolling and all. I'll tell you this, it sounded far from human. It seems that during most of my godhead encounters, an incredible amount of a special mucous coats my vocal chords (not uncomfortable) which can make them sound incredibly deep and grovely. After some very euphoric roaring (felt very regal and majestic), I began to hum a tune. I don't know where it was coming from, and I'm not a great singer in the slightest, but it was beautiful. The vibrations of humming (especially as modulated via the mucous and having one of those peak experiences of life) resonate very strongly with various parts of my body like perhaps I'm doing some self healing. Anyway, that's my DMT singing story. I do like to hum on aya/pharma too, but this experience as listed above was quite automated/instinctual.

I tend to release series of clicks, screeches and whoops - mixed with some asian/germanic sounding tones of jibberish.

The are orchestrated as if they have purpose, and there is usually intent behind the noises, but nothing I'm familiar with.

Wow. You guys yip and holla? I had a friend that always moved his feet about, but that's about as crazy as it got.

I wouldn't be able to trip sit with you guys without laughing

One of the big reasons I don't require any company in the process

Do you feel like maybe it's kind of "witnessing" our brains make sense of crazy stimuli previously unknown?

Or do you feel like it's a download from a greater thing?