Just did a simpified version of the gain mod from
this site. The plan there is to remove the 27k resistor at R79 the PH-2 comes with and then do a switching thing between that and a 15k resistor (basically, lower resistance value means more volume), but really I cannot think of a reason why I'd need to switch between usable volume and really noticable drop in volume, so I went for the 'usable volume' option only, by doing a straight swap of the two resistors.
The picture isn't great as I still cannot find my camera, and my smartphone doesn't have a macro function that I can find, but helpfully the new resistor is bright blue and about twice the size of all the existing ones so it does stick out a bit.
Just did a quick test and it works a treat, now there is no volume drop at all when the phaser is switched on. I'd call that a win really.
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