Right now, the taiko sounds are the same whether there is a soft or normal sampleset in the map. The problem with this is that in regular osu! normal hitsounds are louder than soft hitsounds. If a map switches between soft and normal hitsounds, the sections with normal sections have to have a lower volume than the soft sections to keep the hitsound volume consistent. However, this means that in taiko, the soft sections in these maps will be louder than the normal sections, so it doesn't sound right.
This could be implemented either by creating a new set of taiko hitsounds for soft sections, or by simply lowering the volume of the regular taiko sounds accordingly in soft sections.
This could be implemented either by creating a new set of taiko hitsounds for soft sections, or by simply lowering the volume of the regular taiko sounds accordingly in soft sections.