귀를 즐겁게 해주는Poweramp(PA)에는 많은 기능이 존재한다. 그 중 Replay gain(RG)*은 노래마다 볼륨이 다른것을 보정해주는 기능을 한다. 일종의 볼륨에 대한 normalization을 해주는 기능이다. PA는 실제로 이러한 계산(스캔)을 각 트랙별로 수행하는건 아니고 단지 노래에 저장된 RG 태그값을 읽어와서 이러한 기능을 수행한다고 한다[참고]. 음악의 장르가 바뀔때마다 혹은 마스터링한 시대가 바뀔때마다 볼륨을 직접 보정해주는 수고를 RG 기능을 활용하여 덜어보도록 하자.
[참고] : http://forum.powerampapp.com/index.php ··· -work%2F
ReplayGain is a standard for measuring loudness. When files are scanned by ReplayGain, it determines how much the volume of each track or album should be adjusted to bring it to a standard loudness level. By default, most scanners use a value of 89 dB, which is about 9 dB (often more) below the level at which most popular rock, pop, and hip-hop albums are currently mastered. Additionally, when albums are scanned, two correction values are generated. One is for the entire album. If it is used as the basis for correction, then the differences in the loudness of individual songs on the album will be preserved even as the album as a whole is brought to the standard level. The other value is per-track. If it is used, then every song will be brought to the standard loudness level, regardless of its loudness relative to other songs on the album it's from.
PowerAMP doesn't actually do any scanning. It looks for ReplayGain tags in the music files and uses them to adjust the volume of each track or album (depending on settings). To actually scan and tag your files, you would need to use a program like foobar2000.
As for the settings in PowerAMP, the dB setting is if you want to use a standard level other than the standard 89 dB. If you think your music is too quiet even at full volume, increase this value, but not by more than 6 dB or so. You can use the pre-amp in the equalizer page for the same effect. If you increase the standard volume by either method, you should activate the limiter on the EQ page to prevent clipping in music that was mastered at quieter levels.
