Korg Pa4X User Manual page 382

368| Customizing, recording and editing the Songs
Overdubbing MP3 Songs
MP3 Songs are compressed audio. Compression replaces the original au-
dio stream with encoded audio, taking less space while preserving high
sound quality. Overdubbing is the process of recording audio over existing
audio.
When overdubbing an MP3 Song in MP3 Record mode, you recompress a
compressed file, and artifacts will be amplified. If you transpose the MP3
Song, pitch-shifting artifacts will be added and further degrade the result-
ing audio.
It is suggested to compose using the internal Sounds and MIDI Songs. You
can transpose and overdub MIDI Songs without any audio degradation.
When done with your song, you can record it as an MP3 file.