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My method for the ratio and knee has been to use VST plugin analyzer for software, and drawing up graphs in Excel for the hardware.
I've been feeding the compressors a 1k sine wave that alternates betwen 10dB above and 10dBbelow the threshold, then using a wave editor to calculate the attack and release times.
A few questions -
What percentage of the final value is considered the attack/release time? I've seen a few conflicting ideas.
Is there any software that draw up transfer curves for the knee/ratio measurements (output v input)? I've been using excel, which is a bit of a pain.
Do you know of a similar alternative to VST plugin analyzer? it's really buggy and only works with 32bit plugs.
Tips appreciated :D