It's taken over a year for me to obtain a cataract operation, but I can now see 
well enough to add another response to this Sound-Juicer problem saga.
When I first researched modifying Sound Juicer (aka Audio CD Extractor) back in 
LinuxMint-4 and Ubuntu 7.10 days, I downloaded and printed out the 
'buntu-restricted-extras,  gst-inspect information for the included LAME 
encoder variant (aka lamemp3enc).
However, I was then greatly aided in data interpretation by a Windows audio 
expert (aka Slipstreem), who knew all about LAME developer activities and 
guided my work and use of  no-longer-available graphical EncSpot to assess the 
outcome of applied modifications.
Only being interested in 'CD Quality MP3' that by default was actually only 
Constant Bit Rate (CBR) 128K, I wasn't interested in greater than 320K studio 
quality but in 32K-320K Variable Bit Rate (VBR) quality.

Since then, folk have failed or been unable to add the requisite 'ugly' plugins 
that are part of the 'buntu-restricted-extras suite, which hasn't been helped 
by release varying Synaptic 'glitches'.  Also, in typical typo-intolerant 
fashion, folk have failed to enter the profile modifications that I recommended.
To recap, after Adding 'buntu-restricted-extras and then Sound Juicer, select 
Edit Preferences,  select the requisite CD Drive, select Eject after extracting 
tracks and Open music folder when finished. Next select 'CD Quality, MP3 (.mp3 
type)' Output Format and Edit Profiles, then select 'CD Quality, MP3' and Edit. 
Finally Edit the Gstreamer pipeline as follows and then Close, Close, Close to 
save all modifications, which become the defaults.
Initial, default profile :
audio/x-raw-int,rate=44100,channels=2 ! lame name=enc mode=0 vbr-quality=6 ! 
Id3v2mux
Amend mode=0 to mode=1, to obtain 'Joint Stereo'
Amend vbr-quality=6 to vbr-quality=2, for the benefit of young and keen of 
hearing
Insert vbr=4 to employ LAME's new VBR algorithm (nothing to do with misquoted 
quality)
Insert vbr-min-bitrate=32, to set the minimum VBR bitrate
Insert vbr-max-bitrate=320, to set the maximum VBR bitrate
Hence the final, modified profile :
audio/x-raw-int,rate=44100,channels=2 ! lame name=enc mode=1 vbr=4 
vbr-min-bitrate=32 vbr-max-bitrate=320 vbr-quality=2 ! Id3v2mux
(KennoVO - note that 'lame name=enc' ensures use of the correct LAME plugin.)

In general, note that distributions like LinuxMint-9 'dvds' and
PCLinuxOS have got round all the plugin addition problems by pre-
including them.

Meanwhile, Ubuntu 10.10 Alpha2 briefly introduced a new default as
follows, but it's been abandoned in later development releases, so who
knows what the formal release will use :

audio/x-raw-int,rate=44100,channels=2 ! lamemp3enc name=enc target=0
quality=6 ! xingmux ! Id3v2mux

I don't claim to have achieved perfection with my modifications, but
most if not all listeners are content with achieved playback through
reasonable equipment.

For 'tinkerers' I attach a PDF file reproduction of Ubuntu 10.04's LAME
information etc.

** Attachment added: "Ubuntu 10.04 Lame Encoder etc Information"
   
https://bugs.launchpad.net/ubuntu/+source/sound-juicer/+bug/195483/+attachment/1639201/+files/Lucid-Isadora-gst-inspect-etc.pdf

-- 
Sound Juicer - MP3 quality doesn't change
https://bugs.launchpad.net/bugs/195483
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