Here’s a cheap and cheerful way to get modulation effects without a bunch of fiddling around.
The maDulation plug-in from MadBeeAudio has pretty standard operation with delay, bandwidth, band pass filter, drive, feedback and mix.
Even with humble controls you can get a lot of groovy sounds out of this bad boy.
This is freeware, but if you download it and like what you find consider sending the developer a couple of bucks (the link to donate is on the download page).
Available for 32 bits only.