Here's some recordings I made with a Jazz bass into a Chord BCH-50 bass chorus pedal that I really liked, but thought a little bit too noisy for my tastes.
As it's an analogue unit it's ripe for upgrading components, particularly the opamps.
It uses 2 LM4558 opamps - but only 1 is upgradeable as it's using one of them for more than just a gain stage, so I replaced just 1 of them with an NE5532; identical pinouts mean that it's just a simple swap.
The audio files (DI'd into Protools) are here:
https://soundcloud.com/paul_5/sets/chord-chorus-modifications