The iZotope DDLY is one of the most intuitive and creative delay plug-ins out right now. Use it to create rhythmic variations for drums, add further depth to a sparse guitar part or layer to your heart's desire on synth for anything from a subtle to chaotic sound.
There's the possibility to manipulate the setting in each delay seperately or for a really easy and quick effect, sync them all up to work in harmony for each instrument. An anologue mode provides choice for lo-fi grainy sounds ranging to futuristic, symphonic delay.
Here's what iZotope say about the DDLY:
DDLY Dynamic Delay responds to your track's musical dynamics to create versatile and intriguing delays. It's a one-of-a-kind effects plug-in that delays the signal differently depending on the character of the sound, without turning your track to aural mud. Adjust the threshold to split your signal based on transients, then send it down two separate analog or granular delay paths.
DDLY is actually two separate delays! DDLY analyzes your audio based on an adjustable threshold to determine what to send to the top delay and what to send to the bottom delay. Adjust the Intensity to affect how strongly the signal is split between the two—great for a punchy delay on the harder, transient crack of your drums and a shuffling delay on the main beat elements.