A discrete stereo effects processor will process the left and right sides of a stereo signal independently, from the input stage through to the output stage. Many effects units currently available sum the left and right inputs into mono before passing the signal into the effect processing stage. The effect
processor then creates its own stereo field which is sent to the stereo outputs. Stereo signals that are input into these type of effects units will be compromised. The Roland RSP-550 is one of the few signal processors available that is "true" stereo, and does not sum a stereo input to mono before processing. Many of the algorithms in the RSP-550 feature discrete stereo processing, including the following:
168:Gate Reverb
169:Reverse Gate
170:Ambience
174:Stereo Delay
179:Stereo Chorus
181:2-Band Chorus
182:Ensemble
183:Stereo Pitch Shifter
186:Multi Phaser
187:Dynamic Phaser
188:Stereo Flanger
189:Enhancer
198:Modulation Delay/Reverb
199:Reverb/Reverb/Delay
Algorithm #198:Modulation Delay/Reverb and #199:Reverb/Reverb/Delay are very powerful because they feature multi-effects and discrete stereo input capabilities at the same time. This actually allows independent stereo mixing of effected signals for each effect in the chain. This is especially powerful when used in a recording application.