In reply to:

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I have thought about setting Grip to not delete WAVs and encode new rips into both....but then I have double the tag/comment editing...decisions, decisions! I *did* submit a feature request for Grip that would let me switch config files b/w different LAME and vorbis configs.

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You could perhaps configure Grip to use a script of your own as an encoder. Your script would take three input filenames, the first two being the usual WAV input and MP3 output, and the other being the Ogg output. Then you could turn Ogg and MP3 on and off by editing the script, or by using another parameter.

I hear that Ogg Vorbis is better for seamless playback - if so, then I'm interested for that feature...