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So here's what I did, and the unexpected results using dBpa MC & Audacity to view results of conversions.
Result *3 seems to indicate a bug in the interaction of the Grabber and Fade DSP Effects:
Objective: Cut some trailing noise off the end of a track ripped from CD to MP3 VBR standard (-V 2)
1 - converted .mp3 file, with adding *only* the Grabber DSP Effect to take 2min 25sec from the start.
Result: sounds good & looks (in Audacity) like the desired grab.
2 - converted result of (1), with adding *only* the Fade DSP Effect to Fade Out over the final 2000 milliseconds.
Result: sounds good & looks (in Audacity) like the desired grab and fade.
3 - Tried to do this instead in a single step. Convert original track including trailing noise, with adding *both* the Grabber and next the Fade Out DSP Effects (both as configured in (1) and (2)).
PROBLEM Result: track sounds horrible (amplified way too high, distorted) & looks overly amplified and distorted in Audacity.
So my conclusion is that these 2 DSP Effects interact in some unexpected way.
I would expect that the combined effects (3) should produce an identical .mp3 file as the two step process (1) + (2).
Is this a bug, or do I need to understand some clear limitation in combining DSP Effects ... before inadvertently I destroy my mp3 library.
Result *3 seems to indicate a bug in the interaction of the Grabber and Fade DSP Effects:
Objective: Cut some trailing noise off the end of a track ripped from CD to MP3 VBR standard (-V 2)
1 - converted .mp3 file, with adding *only* the Grabber DSP Effect to take 2min 25sec from the start.
Result: sounds good & looks (in Audacity) like the desired grab.
2 - converted result of (1), with adding *only* the Fade DSP Effect to Fade Out over the final 2000 milliseconds.
Result: sounds good & looks (in Audacity) like the desired grab and fade.
3 - Tried to do this instead in a single step. Convert original track including trailing noise, with adding *both* the Grabber and next the Fade Out DSP Effects (both as configured in (1) and (2)).
PROBLEM Result: track sounds horrible (amplified way too high, distorted) & looks overly amplified and distorted in Audacity.
So my conclusion is that these 2 DSP Effects interact in some unexpected way.
I would expect that the combined effects (3) should produce an identical .mp3 file as the two step process (1) + (2).
Is this a bug, or do I need to understand some clear limitation in combining DSP Effects ... before inadvertently I destroy my mp3 library.
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