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#172 logarithmic fade only spans across half the fade-out-length
Whenever I apply a logarithmic fade, half of the fade ends up being complete silence. This doesn't occur with other fade types.
i.e. If I wanted to have 10 seconds of correct fade-out at the end of the file, I'd have to apply 20 seconds of fade-out during the last 10 seconds, then trim off the other 10 seconds of appended silence.
This works for me. However, after one half of the fading process, the signal is indeed very quiet already: -50 dB, so if it started at perhaps -12 dBFS, it is at -62 dBFS ten seconds in a twenty-seconds fade. This means it is below the resolution of 8-bit files, and possibly below a person's hearing threshold depending on type and volume setting of loudspeakers/headphones, ambient noise, etc. Is it possible that is what you noticed?
I did a few experiments like this
sox -n -d synth 20 sin 440 vol -12dB fade l 0 20 20 trim 0:10 1 stats
varying the start time (10) of the trim effect. On my loudspeakers, I can still hear something at 0:11 seconds, but not at 0:12 anymore. Still, stats shows a signal is present at -72 dBFS, as it should be.
(Technically, logarithmic fade never completely fades out. At the end of the fade, we're at -100 dB, still well within the dynamic range of 24-bit audio.)
I'm not too keen on the science of it, but I understand that that's probably the case.
Other types did sound as they should have, but logarithmic was the closest to what I was listening for. Perhaps more fade types, or even the ability to customize the fade, would make a good feature?
OK, I'll make this a feature request. I'm actually already working on a more flexible approach to fading, including fading not to/from zero. But this will take a while.
Awesome! Thanks for the response. I'm looking forward to the future developments.