bug found by @mekohler on mk1 and confirmed on my mk2, resetting the default SYNTH/SRC page will fall back to completely different values from the default sound for almost every machine on a track that the machine been changed from the default kit.
other menus seem to work fine, SMPL/FLTR/AMP.
on BD CLASSIC it will also cause an ERR on the transient param.
so for example load a BD SHARP on a fresh kit on BD track and hit [SYNTH/SRC+NO] and the values will change for something weird, so is noise, impulse and many others.
example after loading BD CLASSIC and pressing [SRC+NO]:
so I tested this and it seems that what happens is that once you save the kit and change the machine the values will fall back to previous machine state, so for default kit BD HARD is loaded with some params, and if you load any other machine and reset the latest one it will fall back to that BD HARD params, for some machines that means error.
so if you load BD SILKY and tune it and you want to reset that BD SILKY you’d have to save the kit every time you change a machine, which iirc was not the behavior before 1.70, I often switched bd/sd machines and they’d reset to current machine defaults.
another way to emphasize this bug is to load any of the SD machines on BD track and reset the params, it will default values to the BD values which should not happen, it should reset to the snare machine values.