I don't have any recent experience with the onboard Ashdown compressors so I can't comment. But I'm not surprised that you didn't get on with the Ampeg Opto-comp if you're looking for a fast attack because as its name implies, it's an Optical circuit that is doing the compressing. The main characteristic of optical comps is that they have an inherently slow attack time, relatively speaking, and tend to swell into the note as it crosses the threshold. They are often used on bass to make the tone
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