update: i think i have found the problem, because i use my Roland drum kit to record my patterens straight into Reason 10 midi lane, in settings/edrums, i have that set to roland or generic cc hi hat, or generic, but when i playback my recorded pattern it does not trigger stacked snares, i changed the edrums setting back to default and now the stacked snares are being triggered, so i guess there’s some midi cc notes filter when edrums is set to Roland or other.
i have same issue, my DAW is Reason 10, i think i found the answer to my issue, in settings , edrum , it was set to roland , this is because i usually use my roland TD9 kit to record my drum patterens straight into Reason track lane, like you the stacked snares was not triggering, until i turn the setting in edrum to default, and now the stacked snares trigger correctly, so i think some midi cc notes are being filtered when the edrum is set to anything but default.
