For those who don't know, a kire/powerscale voicebank is a multipitch voicebank recorded with weaker lower pitches that go more powerful as the recorded pitch increases.
Personally, I really like how each pitch is recorded in a different tone compared to a full-on power voicebank which gives it more variance. So even if you want to make a soft cover out of a kire voicebank you can use the lower pitches on higher notes if you don't want. Or if you want a different tone on a certain note, you can use a higher pitch for a brighter tone or lower pitch for a darker tone.
Personally, I really like how each pitch is recorded in a different tone compared to a full-on power voicebank which gives it more variance. So even if you want to make a soft cover out of a kire voicebank you can use the lower pitches on higher notes if you don't want. Or if you want a different tone on a certain note, you can use a higher pitch for a brighter tone or lower pitch for a darker tone.