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Note that the attenuation is constant at all settings (except for 'Off' which does not alter the signal).

My intention was to check the audibility of second-order distortion on music, which already contains harmonics. The maximum setting (-12dB) corresponds to 25% THD which is insanely high in terms of "modern" equipment (DAC, preamp, amp, ...) performance. Currently, I do not have any decent...

Okay, I clearly missed the fact that there is a plugin for Foobar which can load DST effects :-)

I just wanted to offer an alternative for people who do not have the possibility to use VST plugins.

Yes, I already found it before. It is much more sophisticated, but I wanted to do it real-time, without the need to prepare test files.

To test the audibility of pure second-order distortion I have written a Foobar plugin which simulates a quadratic transfer function. On the configuration dialog of the plugin, you can set the desired level of the second harmonic in 24 steps between -150dB and -12dB and also turn it off...