yes, i read sound only works for homebrew when installed via cia, not .3ds - i think that is for old3ds and new3ds.
but only on new3ds, ninjahax can't have sound for homebrew... right? i never used it myself.
and a 'old'/broken save encryption forced to use 4.x, does not work when the real keys are present on the system?
anyway, gw mode would not use them anyway i think, only in classic mode