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o_lampe
Does that also work with the "normal" version of the drv8825 drivers, where the chip is on top of the PCB? Where did you get yours from?
I ran my delta with modded drv's and they only got loud while steppers were standing, which is almost never on a delta.
I believe mine are the m20b version. The m20a version had the chip on the top. As far as I know, this hack should work, but crack out the multimeter and make sure. I purchased these from reprapdiscount along with my RUMBA that I'm not so happy with.
While running, they are quieter from what I can discern. As you mention, when the motors are simply holding/stationary is when that noise can get to you.