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From: "Prescott, A." <ap22@...>
Date: Wed, 1 May 2002 at 12:31:23 PM
Subject: [GEN] M'aidez! Audio clicks on CDs
Message #104885
HELP! I recently restored an old cassette recording using Waves Restoration in Logic Silver 4.7, with a view to burning an audio CD of the results. As it was a "continuous" live performance I went to some trouble to chop the audio file into individual songs such that they would sound OK whether played individually or in sequence. But on playing the CD I hear a sharp click between one or two of the tracks. It's really ironic because Waves did a great job cleaning up the original sound, but now, right at the end.... I've carefully checked the starts and ends of the offending wav files, but there's no evidence of any zero offset problems, indeed when I play the files sequentially they don't click at all, even if I join them all together and play them as a single file. I've even tried adding 100ms or so of silence to the starts & ends of the tracks, yet still the wavs play fine but audio CDs give clicks! I can see no difference between the track "junctions" that work and the ones that don't. I've never had any trouble before with the audio CDs I've burned, although most of them have been individual songs with plenty of silence at the start and end. I've heard that CD burners suffer from "write offset" which might chop off a small part of the start or end of files (my burner is a HP 9150i), but surely not more than 100ms? I've also heard that the length of a wav file for CD-audio needs to be an exact multiple of a CD sector, which is (apparently) 1kb. Is this true, and does Logic have any way of rendering a file suitable? I ran Waves on the whole recording using the bounce function, cut it into tracks in Cool Edit, then re-imported into Logic's Sample Editor to tidy up the ends. Thanks, Andy
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