There are 33 SU plugins, which are building blocks that can be used to create more sophisticated sound processors.

The SU library combines these plugins in the following effect patches:

• analog equalizer provides a ten-octave equalizer modeled on analog electronic circuits;
• delay equalizer is a feedback delay that offers panning, rectification, ping pong and filtering options;
• low-pass filter is a filter with a smoothly variable cutoff frequency;
• low-pass follower modulates filter cutoff frequency based on the envelope of the input signal;
• mastering equalizer exhibits linear phase characteristics and extreme levels of inter-band separation;
• mastering limiter provides a way of increasing perceived output levels in a neutral-sounding way;
• multiband compressor applies vacuum-tube compression to the individual octaves of a signal;
• tape compressor emulates the compression characteristics of analog tape recorders;
• transient controller allows independent control over attack, decay and sustain components of audio signals;
• tube follower modulates vacuum-tube saturation based on the input signal's envelope;
• tube vocoder combines its left and right inputs as carrier and modulator, also utilizing vacuum-tube emulation.