TOPIC: Shift tuning down

Hi,

Currently, if I need to create a specific preset that plays one octave lower, I use the "Tuning (semi-tones)" and set it to "-12". It works but the sound is not great, probably because Polyphone is processing the audio. Instead, how can I tell Polyphone to shift one octave low (no mess with the sound, just play any note as if it was 12 notes lower). Is there an option to do this?

set Root Key for each sample 12 semi tones lower and Instrument> Automatic Distribution