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Pentium
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Want to convert CDs into MP3s with results as good as Slipstreem's recommended CDEX in Windows XP approach ?
(With results like WinXP-CDEX.jpg ?) Summarising the approach originally RESOLVED with Slipsteem's help, in Ubuntu 8.04.1, after installing Ubunto Restricted Extras (ubuntu-restricted-extras) to install the LAME MP3 encoder, if you fire up Applications, Sound & Video, Audio CD Extractor (ie Sound Juicer) and go to Edit, Preferences, Format and select 'CD Quality, MP3' then 'Edit Profiles', then highlight 'CD Quality MP3' and click on 'Edit', a Profile editing window appears.
Entering its little 'GStreamer pipeline' window, you can change mode=0 (stereo) to mode=1 (jstereo), insert vbr=4 (for new lame VBR algorithm), insert vbr-min-bitrate=32 vbr-max-bitrate=320 and change vbr-quality=6 to vbr-quality=3 to conform to Slippy recommendations for LAME encoder use and achieve the following on one line :
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=3 ! id3v2mux
If you then 'Close' all open windows, this palaver gets remembered even after a Restart and then automatically creates compressed MP3s in a 'Home' folder that are indistinguishable in quality from the original CD. (Thus achieving HeronSoundJuicer.jpg results.)
If you then insert an audio CD it will offer to play but will also invoke Sound Juicer and quickly display track information for its MP3 conversion. Just click on 'Extract' and away it goes, usually taking less than five minutes per CD. The results achieved are also highly compatible with Amarok jukebox.
(Amarok newbies - see http://amarok.kde.org/screenshots) 
Note that if you are a Mint or Intrepid user you can do a Package Manager (Synaptic) Search and Apply of sound juicer after applying ubuntu-restricted-extrasand then make this configuration change to their version of Sound Juicer.
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286
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Is it not possible to alter the conversion quality with ogg files?
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Pentium
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486
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there are lossles codecs, and lossy codecs.
Ogg is generally better at the same bitrate as MP3
Variable bitrate is better than constant.
AAC or FLAAC is lossless, IIRC
EDIT: every time you convert, it gets worse.
Always transcode from the original.
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486
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To get Grip working you need to install the "Lame" package as well and specify Lame as the encoder in Config>Encode>Encoder and make sure that:
the "Encoder executable" field shows: /usr/bin/lame
the "Encoder command line" field shows: -h -b %b %w %m
the "Encode file extension" field shows: mp3
the "Encode file format" field shows: ~/ogg/%A/%d/%n.%x
In Config>Encode>Options you can set the desired bitrate.
In Config>Rip>Options if desired, select Auto-rip on insert and Auto-eject after rip.
In Config>Misc if desired, select Do not lowercase filenames and Do not change spaces to underscores
Set this way, open Grip then on inserting an audio CD Grip will auto-rip and encode as .mp3 to a folder called ogg in /home then spit the CD out.
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Pentium
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@ wyliecoyoteuk 
In my case 'the original' can mean vinyl, which is why I am hoping that a special ultra low noise, wide dynamic range RIAA preamp that I designed and built some thirty years ago will turn up. I have some vinyl records that never got re-released on CD, but most of my 'originals' are in the compromise CDaudio format, on CD. Re-encoding is always better with as few sequential conversions as possible, which all also applies to video files, with Hollywood now desperately searching for good quality film prints that they can re-master and archive in 'SuperHD' format before the film crumbles away and so that they can re-release video DVDs or Blu-Ray discs.
I guess that when it comes to audio coding, at the other end of the sequence, you need to first check out what player(s) you will be using, and how good your hearing is. I used to hear the 'whistle' of fluorescent lights, let alone the whine of '625-line' TV line frequency, but now I am really surprised that I can still appreciate the differences that I have described.
@ gn2
Thank you, I'll try your approach and see if it produces similar or better results. Meanwhile, the speed plus quality of re-encoding with Sound Juicer v2.22.0 is quite impressive, but what differences can you perceive with Grip ?
(As I type this, I am already re-enjoying the results with Amarok.)
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Still Learning and Trying to Keep It Simple in Sharing knowledge
[A] rig..ASUS-EN8500GT SATA-320+80GB G31MX-S2 2.6GHz E2160 2G
[B] rig..384M_XFX8800GS SATA-320+500GB G31MX-S2 2.9GHz E4600 2G
32-bit Mint4, Mint6rc1, WinXP & Vista Home Premium. http://tinyurl.com/MP3-Creation-with-the-Heron
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486
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Bruce R (16/08/2008)
@ gn2
Thank you, I'll try your approach and see if it produces similar or better results. Meanwhile, the speed plus quality of re-encoding with Sound Juicer v2.22.0 is quite impressive, but what differences can you perceive with Grip ?
I have no comparison as I have only ever used Grip, not Soundjuicer.
Grip is very fast compared to tools I have used in the past in Windows.
The resulting .mp3 files at 192kbps sound identical to the original CD to my (47 year old) ears.
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Pentium
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Hi gn2
It sounds as though we are achieving similar conversion speeds and ease of use once configured. Whilst typing this reply, I am listening to Amarok playing and I simply inserted another CD and it was auto-detected by Sound Juicer and its track listings retrieved and displayed, so I just clicked on 'Extract' and it has already created the MP3s in Home/Music. I could direct Amarok to that location, but I'm using another logical drive for my audio collection, so I just 'drag and drop'.
Regarding comparison, I think that I'll try 'side-by-side' original versus MP3 playing with VLC Player, which Ubuntu multi-tasking should support. It may be a bit of a row, but it should make comparison easier. Meanwhile, another 'Mac' CD encoding completed. At this rate, it'll be hours rather than weeks before my collection is completely re-encoded ! 
Edit PS - I don't know about you, but I stopped hearing really high frequencies around twenty-eight years old, with further gradual reduction thereafter.
....................... Signature ......................
Still Learning and Trying to Keep It Simple in Sharing knowledge
[A] rig..ASUS-EN8500GT SATA-320+80GB G31MX-S2 2.6GHz E2160 2G
[B] rig..384M_XFX8800GS SATA-320+500GB G31MX-S2 2.9GHz E4600 2G
32-bit Mint4, Mint6rc1, WinXP & Vista Home Premium. http://tinyurl.com/MP3-Creation-with-the-Heron
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