fdelay contains a bunch of units based on -- you guessed it -- delays.

This set is the next generation of the old FilterDelays package. Sorry, I renamed it. The old one is still available on GitHub.

Filter Delay

The Filter Delay unit is a simple clocked delay with a tone control in the feedback loop. The stereo version also has a randomized 'spread' control.

The stereo verion uses 9%-10% CPU.

Tuned Filter Delay

The Tuned Filter Delay unit is a simple delay with a tone control in the feedback loop and a V/Oct tuned delay time. When you feed it noise pulses, it sounds Karplus-Strong-like. When you feed it anything else, well...

Note that due to the way the feedback loop is implemented, the maximum frequency is about 375Hz.

The stereo verion uses 9%-10% CPU.

Manual Grain Delay

The Manual Grain Delay unit is the unholy child of Filter Delay and Manual Grains. It is a delay line with tone control in the feedback loop. But instead of just playing the delayed signal, you trigger grains, with all the usual controls you expect from grains: pitch, duration and squash (pan is coming in some next release). You can also freeze the delay loop and play with grains in the frozen buffer. It's a bit like part of Mutable Instruments Clouds, but without the auto-triggering and the reverb.

The stereo version uses 10%-40% CPU, depending on how many grains are running concurrently.

FDN

The FDN unit is a Feedback Delay Network, inspired by the paper by Tom Erbe - UC San Diego: REVERB TOPOLOGIES AND DESIGN.

With small delay times, it sounds like a simple reverb with tone and feedback control. But the delay times go so insanely big that it can also behave like a delay that eventuelly smears out into a reverby sound.

The stereo version uses 20% CPU.

SFDN

The SFDN unit is a simple version of FDN, without modulation. Because of this, cheaper delay lines can be used.

The stereo version uses 11%-12% CPU.