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For replacement/substitute parts, see this forum topic: http://www.ladyada.net/forums/viewtopic.php?f=12&t=4610
LadyAda ships with these replacements, with no noticeable sound differences
—- SubAtomic has done some analysis of these, and has found BA6110 to be only slightly different, yet perfectly acceptable (perhaps even more desireable: it's a little louder, which can be a useful thing to slightly overdrive the mixer output for a little distortion)..
—- MomeRath reports that replacing these causes no sound difference:
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If you find other substitutions that still maintain the original sound, please post your results in the above format…