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From the project's README ("Soft focus"):

Two generations:

• GR Mod 0.4.x (core/src/fw/clarity.ts) rewrote rows of the camera's clarity table (RTOS 0x53b4c860, 9 rows for clarity −4…+4 of 11 int16 gains in Q10, finest band first) so that clarity −2 / −3 / −4 became weak / medium / strong soft focus. Such files are still recognised and verified; the program no longer writes them.
• GR Mod 0.5.2 (core/src/fw/aspect/softfocus.ts) puts soft focus on the ADJ lever with four values (off / weak / medium / strong) and leaves the clarity table official. The ADJ controller is table-driven (21 records of member-function pointers at 0x53d9f714, addressed from 23 places). Soft focus takes over function 0x0A (Flash Exposure Comp.), which the GR IV never offers on the ADJ lever (not in the ADJ mode setting list, not in the fixed layout of any camera mode); its record is overwritten in place with Crop's, carrying four new handlers, so the table does not move. The ADJ mode setting list gets 0x0A after Image Control; its name is text 840 in all 21 languages and its icon is icon 720 (bounds never above what added ratios use). The value is kept in byte 0x90F of the user settings, alignment padding that the factory-defaults initialiser never writes; the structure is saved, loaded and copied to U1–U3 as a whole, so the value survives power-off. Whether a picture goes through the digital-filter step at all (0x537150fc) depends on Clarity being non-neutral for most image controls; while soft focus is on it counts as non-neutral. DigitalFil …

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