Pseudo-vintage and generally useful instruments and voices.Virtual instruments - voices, pianos, orchestral, electronic - that are degraded in an analog(ish) way, have some organic component, and are more mellotron than mellotron. Nothing pure. From my personal brainstorming journal, some examples of what might be incorporated into the sounds: Tape saturation; Tube saturation; Analog synth filters (with envelope, LFO, etc.); Speed manipulation (pause button glitch attacks, etc.); Re-recording through crappy and/or treated speakers; Built-in echo; Phase-correct pseudo-pan; Spring reverbs; Notching out fundamental, even harmonics, etc.; Person walking away from or towards mic while singing a note; Sounds that start in mono but widen as they go along; Deliberately trying to make one thing sound like another thing, i.e. crossing the tone of one thing with the envelope and/or pitch curve of another; Putting portable recorder on turntable and spinning it... and so on. That said, I have no rules against digital manipulation, either before or after these other types of manipulation; for example, using smart pitch-shifting algorithms to interpolate missing notes.