I also cannot find anything on "change iso" which I would like to know how to.
ok, good to know you at least tried, might be hard to find.
you probably wont find anything on "ISO" as the Setting for Light Sensitivity on this camera is labeled as "Gain".
There Is a Analog Gain Setting and a Digital Gain Setting, both go from 0 to 24 dB in Steps of 6dB, where a 6dB step is about equivalent to a Full Exposure Stop (like doubling ISO number for example from 100 to 200 would be about same as 6dB more Gain). Doesnt perfectly line up always to give an Actual 1 Stop brighter Image though, so watch out for that.
0dB on Both would be native "ISO" / Base Gain, and both of those Settings add up to give the final Sensitivity.
Analog Gain does actually Raise some kind of Voltage (Hardware) on the Sensor or in the Signal Processing Pipeline that comes After to give a Brighter Image, Digital Gain does just Digitally amplify the Signal somewhere later down the Line, similar to what you would do in Editing when Raising Exposure.
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For more detailed Info look at the User Manual Page 68 to 70:
https://www.krontech.ca/wp-content/uploads/2021/09/RE-PDEV-10009-Chronos-User-Manual-Full-Software-Version-0.7.0.pdf