ok, there is an option to change the balance between music and sound effects, with this you can turn off the sound effects completely. But it also turns off every single other sound effect in the game (the only thing i didn't check is the MC part during lives).
Incidentally i unlocked a no-sound drum sound 30 minutes ago with a producer rank of "super producer". I don't think every achievement is worth the same towards producer rank, but to give you an idea: i had 63 of the 99 achievements at that point.
I don't know if it's always like this in TnT games or if it's a pun, but the no-sound drum sound is called 音なし, which means "with no sound" and is read as "otonashi". If anyone is looking for it in the shop, it has this kanji as sound "picture": 無