The Inon Z330 Manual has instructions to control flash mode and intensity on pp 21-23.
1. Push in and lock the Advanced Cancel Switch, the lower right.
2.Set the Main Mode switch (upper left) to M (or Full if needed).
3.The EV Control Switch (upper right) controls the flash output.
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ReefPhoto has this for some previous Inon flashes, like the D2000 and Z240: https://reefphoto.com/blogs/lighting/selecting-the-proper-settings-for-inon-strobes-1
ADVANCED CANCEL CIRCUIT
This feature is for use with External Auto and Manual Modes when using pre-flash type cameras. The circuit reproduces the camera’s pre-flash, but at higher intensity than the camera flash. This creates optimum underwater performance, faster recycle time for the camera flash, quicker follow-up shots, and longer camera battery life.
To accomplish this, the INON emits a pre-flash up to 22 times stronger than the camera pre-flash. The camera 'sees' this strong pre-flash, judges the subject to be close to the camera, and decreases the power (duration) of the main flash by the camera. The minimal main flash by the camera results in faster recycle time of the camera flash, and extended camera battery life.
If your camera does not fire a pre-flash, ACC must be disabled.
The ACC is ON by default, but can be disabled in one of two ways, depending on the model of strobe:
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Strobes with a Magnet Hole
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Strobes with a Dial Switch
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For models with a magnet hole type switch, insert the provided magnet and secure in place using the provided retaining screw to disable ACC.
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For models with a dial type switch, depress the dial and rotate to lock in the depressed position to disable ACC.
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