I’ve been doing visuals since 1965, I progressed by modifying 4 edmund scientific 500 what slide projectors (they were brighter than some 750 watt projectors) so I could reach inside and add vertical liquids compartments , patterned glass plates and so forth. I did NOT use wheels except at the front of the lens where I sometimes used strobe wheels to flash different projectors with similar images alternately for animation effects. the slide wheels of those projectors could be turned by hand and with the four projectors lights hooked to on off switches at my feet that could be rhythmically activated (yes they burned out a lot as a result, but they were cheap and the rhythmic fade in and out of the bulbs instead of cutting in and out was precious!) and restate and hand drag speed controlled strobe wheels in the front as well as instantly manually dialable hand painted slides (I was very good at painting those) I was able to do what I call hand animation, like “Frank Film, only live and with multichamber vertical air bubble oil and water movable clear and pattern glass in the liquids and also movable pattern glass slide image light”molding” effects which are unlike “Frank Film” I feel that analog projection is exactly like analog sound, an electric guitar is a poor replacement for an acoustic guitar and vice versa, synthesizers do not negate acoustic instruments nor do acoustic instruments negate synthesizers. the different MEANS of control result in inherently different ENDS. Video feedback is a to die for addition to analog means as well as using a camera and digital projectors to AMPLIFY analog projections on a small screen for a much bigger screen.I feel sequencing does not usually tend to do as well musically as manual control because it places a barrier between emotion and the art, and I feel manual control of visuals is even more crucial to making them EXPRESSIVE. In the past too much credence was given the technology and not enough credence the artistry, that this actually killed off light shows as automated means replaced physical means an also because the audience could not see the artist so assumed it was a machine. If Hendrix had been behind the screen people might have thought he was just a device too. This was the biggest mistake made in the past, it is MUCH more impressive to an audience to SEE and be INTRODUCED to a PERFORMER, that way they know they are witnessing an ART and not an automation. In my opinion light shows were the greatest art form in human history yet they were treated as the least significant art form because they were not positioned correctly politicaly…light artists should have been billed as the STARS, that way the form would have not vanished or nearly so.