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Old 12-10-2019, 02:43 AM
Join Date: Dec 2004
Location: Gent, Belgium, Europe
Posts: 105
Default Signal Generator plugin 24 bit level waveforms in 32 bit float container?

Hi everyone,

I just bumped into what seems another problem of Pro Tools dealing with 32 bit float processing. The problem is with the Signal Generator plugin (both as insert and as AudioSuite). It doesn't seem to generate proper 32 bit float waveforms, but rather seems to clip them at 24 bit level, even in a 32 bit float session!

Steps to reproduce: (example for insert mode)

1. Create 32 bit float session
2. Create Aux
3. Insert Signal Generator (e.g. 440Hz, 0dB, *RMS*)
4. This will obviously clip the Aux output as the peak will be above 0dB for a 0dB RMS sine. So turn down the Aux level (fader).
5. Observe that the sine keeps sounding clipped, i.e. the 32 bit headroom is not used to restore the sine!

Same behaviour is observed with AudioSuite: Although the plugin generates a 32 bit file, it's actual contents seem to be clipped to 24 bit level and are non restorable with fader, clip gain, gain or normalise plugins.

It thus seems that the plugin is not outputting proper 32 bit waveforms, but rather 24 bit level in a 32 float container.

I already filed a case with Avid for them to have a look as well.
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