It rocks when used - Proform Hybrid Trainer Elliptical

By 'side to side' I'm assuming you mean it's rocking left to right and not front to back? The most common direction it will rock will be on a diagonal line. How far is it rocking? A small amount or a large amount? Small amounts can be adjusted. If it has recently started rocking badly, especially on high spin, it might suggest there is another issue that needs looking at.
Most machines only have adjusters on the front. Wind both feet all the way In then wind them both Out again 5 full turns. You might need a helper for this as you will need to tilt the machine to take the weight off the feet. Physically push and pull the machine to see which direction it is rocking. It will always rock on the highest points. On the corner that lifts wind that foot Out half a turn and the other foot In half a turn. Repeat this using Half or Quarter turns until the machine levels out. If the rocking direction changes sides wind the foot you have just wound Out back In the half/ quarter turn you have just used but Not the other foot.
You might need to 'fine tune' with more eighth and quarter turns over the next few times you use the machine. At this point you only need to adjust the foot that actually lifts off the floor.
If it rocks evenly down the centre line of the machine it might be the actual floor causing the issue.

Don't stand on it and you won't feel it rock. Also tighten the cables and it won't have as much rocking

It is very safe and even recommended to use a rocking chairduring pregnancy. Infact, it is betterthan sitting on an exercise ball and rocking because a rocking chair has backsupport.

Using rocking chairs to generate energy is great idea and isalready in the works with a few products through utilizing the kineticenergy. There are rocking chairs withlights attached so that as you are reading and rocking, you are charging yourreading lamp at the same time.

Making up the majority of the Earth's crust, rock is usually defined as a mixture of common minerals.

Rocks can be hard or soft, as small as a grain or as large as a building. They have been an integral part of the history of mankind, first being used as tools for hunting and defense, and as a building materials to construct shelters and monuments.

Combined with the effects of tectonics, weathering and vegetation, rocks define the natural landscapes we see around us. The minerals and metals we find in rocks are essential to the prosperity and cultural splendor of human civilization.

There are many kinds of rock, and they can be classified in a number of ways. However, geologists classify rocks based on how the rocks were formed. The three classes are:
1) igneous rocks (formed directly from liquid rock),
2) metamorphic rocks (formed by direct alteration of existing rocks), and
3) sedimentary rocks (formed by eroded materials from other rocks).

I used to have exactly that same rock tumbler. I have a bunch of polished rocks out in my garden that the kids and I made with that thing.

I don't have the instructions, but there are some perfectly great generic instructions on the geology.com web site: http://geology.com/rock-tumbler/rock-tumbler-instructions.shtml

I used these directions with great success.

LP grills are designed to use lava rock ONLY. Charcoal will clog the burners.

the mic is the ONLY instrument you can use with a controler sorry

i don't think so about the headset but yes for the hsm sing it microphone