The great machines begin to fail and the energies they were supposed to harness began to pour into the world, and the Ruinous Powers began to mould those energies - but the machines were more clever than they expected, as most of the energies were transformed by their passage into the world into forms that followed their own natures, rather than the orders of the Ruinous Powers. But enough remained true to them that they were able to pour their minions into the world.
This is probably the most substantial relevant information we get, from Deathfang's children's story.
So the machines, the polar gates, 'were supposed to harness' at this point undefined energies.
When they broke, Chaos 'began to mould' those energies. There's an implication that Chaos expected to be able to do so ('more clever than [Chaos] expected'), and that these energies are probably not intrinsically linked to Chaos before being moulded.
The energies (un-'moulded') 'were transformed by their passage into the world into forms that followed their own natures', which most likely indicates that after this transformation they became the Winds. Deathfang attributes the transformation to the polar gates even though they '[began] to fail', as they 'were more clever than [Chaos] expected.' While Deathfang could be wrong about this, it seems like something they could plausibly know simply by comparing the situation before and after the failure of the gates.
So what I get from this is that we go from undefined energies (probably not Chaos-aligned) being 'harnessed' (which can mean basically anything in this context, especially since Deathfang doesn't seem to even care how the Old Ones used their magic) to them being partially 'transformed' into the Winds, and partially being moulded by Chaos (it kind of sounds like Dhar, but while Dhar is chaotic (small c), I don't know if it's Chaotic per se).
With AV being theorized by Mathilde to be the raw stuff of the Aether, not transformed by normal passage into the world, I can accept that the undefined energies are like AV. However,
as far as I can remember, there is no real indication in quest canon what the Old Ones did with those energies when they 'harnessed' them*. We only know from Deathfang that most of the energies after spilling through the failing gates become the Winds, that this was a property of the gates.
It's possible that the gates were always transforming the energies into the Winds, and the gates failing meant that the process was now uncontrolled. The 'clever' part being that even when failing they still managed to deny Chaos most of the energies.
It's also possible that the Winds were a safety measure in case the gates failed. The 'clever' part being that the Old Ones had anticipated their works failing**.
*Turning them into the Winds in a controlled fashion for further use? Using a stream of AV to turn a decadent water wheel? Who knows?
**(Not being serious here, but that hardly seems in-character for the Old Ones from what I've heard of them. Or for any Ancient Precursor race in fiction)