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Hey Newty, I replied to your PM, but I'll post it here as well, since others may want to read it, or add to it:
The crackles are due to your CPU getting hammered and it's sorta the opposite of latency. The trick is trying to find a buffer size that achieves that balance and you probably have to switch your buffer settings depending on where you're at in the production process.
Latency is the delay that occurs at higher buffer settings. In other words, if you play a note on your MIDI keyboard or record a sound into your DAW, there is a momentary delay between hitting the note or triggering a sound and hearing it out of your speakers. At high buffer settings, the delay (latency) is increased (longer) - this makes it hard to play in time or, if you're recording vocals for example, the vocals will come through the headphones several ms after they're sung and will throw the vocalist off time, annoy the hell out of him/her, etc.
At low buffer settings, the latency is short. So, if you're running your buffer setting at, say, 64, you shouldn't hear any delay. But, it's putting more strain on your CPU to use a small buffer size. So, when you're early in the production process and you're depending on playing your keyboard or recording something and hearing it playback instantaneously, you want to use a lower buffer setting. As your project builds in size (esp. adding CPU-heavy plugins like reverbs), your CPU will start to get hammered at low buffer settings, and you'll start to hear clicks/pops and/or get audio dropouts. So, you need to raise your buffer settings to take some strain off the CPU.
tldr: early in the project stage when creativity/performance or recording is the primary goal, use a low buffer size (i.e., low latency/manageable CPU hit); increase the buffer size as the project progresses and you get more into the mixing stage (i.e., higher latency/smaller CPU hit).
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