LoFi Choirs contains 24 free patches for Spectrasonics Omnisphere 2 synthesizer.
This soundset is very experimental and its patches could fit to your music exploration on a variety of genres and styles.
The use of vintage styled effects add a nice Low Fidelity character to them
Also in some patches the gritty and noisy character is coming from the waveshaper device of Omnisphere.
You could grab your free copy with the manual here