I'm using dbPoweramp to rip all my CDs. I don't know if this is a wacky way of doing it, but they write all the metadata into a VORBIS_COMMENT section. At least according to metaflac, but the FLAC format is new to me, so maybe this makes perfect sense

Either way, I'd like to have some of these values show up in MC. I tried creating a new field with a value of: "replaygain_album_gain=", but MC just shows an empty field.
I assume if it works for one of attributes below it should work for any of them, is that correct?
One of the reasons I want this is so I can use AccurateRipDiscID to help weed out all my duplicates. This way I can see what I ripped with dbpoweramp vs who knows what.
METADATA block #1
type: 4 (VORBIS_COMMENT)
is last: false
length: 579
vendor string: reference libFLAC 1.2.1 20070917
comments: 18
comment[0]: replaygain_album_gain=-8.3 dB
comment[1]: replaygain_album_peak=0.988647
comment[2]: AccurateRipResult=AccurateRip: Accurate (confidence 94) [9703FCD6]
comment[3]: AccurateRipDiscID=012-001797ba-00ded309-8b0cc40c-1
comment[4]: Title=The Boogie Bumper
comment[5]: Artist=Big Bad Voodoo Daddy
comment[6]: Album=Big Bad Voodoo Daddy [Interscope]
comment[7]: ALBUMARTIST=Big Bad Voodoo Daddy
comment[8]: Genre=Swing
comment[9]: Date=1998 02 24
comment[10]: UPC=606949029029
comment[11]: Style=Retro Swing
comment[12]: replaygain_track_gain=-9.2 dB
comment[13]: replaygain_track_peak=0.988647
comment[14]: TRACKNUMBER=1
comment[15]: TOTALTRACKS=12
comment[16]: DISCNUMBER=1
comment[17]: TOTALDISCS=1