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There's an important exception to this rule: if your clicks come at regular time intervals, such as in buzz or GSM (cell phone) interference, choose Multiband (periodic clicks). In most cases, Multiband (random clicks) is a good starting point, if you prefer quality over CPU load.How do I choose the mode of Declick and Decrackle? Decrackle mostly works at mid and high frequencies, while Declick is also helpful on low frequencies, especially in Multiband modes. It can work with very dense clicks, while Declick assumes that clicks are discrete. If clicks and crackle are minor, but very frequent and dense, almost merging into a static noise, use Decrackle.Often times, 2 passes of Declick will do a better job than a single pass, because the first pass can uncover smaller clicks that could be missed among larger clicks. If clicks are strong and significantly corrupt the underlying intervals of the signal, definitely start with Declick.So, which one should you use? The short answer is: use Declick first, then use Decrackle if more cleanup is needed. Decrackle attenuates detected crackle to blend it with the surrounding, similarly to Spectral Repair's Attenuate mode.Declick throws away each detected click and synthesizes the replacement signal, similarly to Spectral Repair's Replace mode.