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Ok, so I've just been messing around with the FF Pro-C and thought you should be subjected to a whole lot of my ideas and opinions.
*It's got a graph!!! Yep that's right a graph that shows gain reduction over time as well as the input and output waveforms. I believe the Pro-C was the first ever compressor to do something like this. If you're a total compressor noob you can use this to get your head around concepts like attack and release. However the implementation is not great. The GR is pale pink, the input is pale white and the output is pale yellow. It's a horrible choice of colours. To make matters worse, when you click "expert", the graph slides away to the left and becomes mostly obscured. Not exactly a clever design. Compare this to the huge, very legible graphs you get on the Pro-L and Pro-G. (These were produced subseqently to the Pro-C so I guess they learned from their mistakes).
*FF make a big deal about this being "program dependent". What does that mean? Well it means that rather than responding to a fixed value, the attack and release times vary somewhat depending on other variables such as frequency and duration. Maybe I'm not nerdy enough to care about any of this. I switched back and forth between the clean, feedback and opto modes to examine the differences (using drum loops). At normal GR (ie -5db) they all sounded the same to me. You also have the option of using an "automatic" release, but again I don't really see the point.
*The wet/dry option is implemented as two separate volume knobs. This makes it slow and clumsy to do parallel compression. You can however pan the dry signal to the left, right, mid, sides, etc. I tried it out and it does sound interesting in some situations.
*The sidechain option suffers from a similar problem. Instead of having a single pan and gain you get two pans and two gains. I really can't imagine ever needing this, and if I did I could employ it directly in the daw.
*The attack starts at 0.5ms and the release at 50ms. This makes the Pro-C slow compared to other compressors and totally inadequate for some applications. It might be well suited to long accoustic tracks where the volume wanders considerably.
*I think the Pro-C bears more than a small resemblance to the native ableton compressor. They both aim for transparency and do opto and feedback emulations. And from Ableton 9 they both have graphs. Is Ableton copying Fab Filter?
*It would be nice to have a clean bypass button on the gui.
Conclusion: This one could be a good choice for vocals or accoustic recordings with a meandering volume. Maybe try it on jazz or classical. There's nothing special here for EDM producers.