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As the price point of your software goes down one of the things that suffers is going to be reliability. (I'm seeing several red flags here including a very low price and only outputting half a universe of DMX). Having just checked out their site, at first glance it seems to be a very low end program. The computations neccesary for your smooth fade should be pretty elementary for your control program to do so I don't suspect it but I have no experience with lightkey so I couldn't rule it out completly. The quality of components and design needed for high quality fades are just too high to allow for use in a low budget product. There just isn't an led product on the market with quality fades at that $100- $150 price point that I've seen. The led market is very much "you get what you pay for" and the dimming curve is usually the first place you start to see quality suffer when you sacrifice price. They way the light itself processes the dmx signal is most likely to blame. The built in fade does not pull its fade information from dmx which is limited to 8 bits of resolution per channel. Having more "subpanels" coming up at different points seems to sort of cover-up/blend things and allow for a modicum of subtlety. Controlling some red channels manually with 4 MIDI knobs to do this with my hands produced some. if I want to fade more smoothly from black to red, I could set up these "keyframes" (sorry, borrowing terms from other fields as I learn):Īnd so on. Like, the fixture is effectively 8 individual RGB LED lights. I suspect that my only way out of this is to write some routines that bring up/down the brightness of progressively more of the sub-panels (forgive me if there's a better term). (By the way, QLC+ is being pretty explicit about the uDMX unit working at 30 Hz, which should be fast enough to have a reasonably subtle fade.) Having now spent some more time with the light (controlling it now with QLC+ which had a profile for the fixture already, which makes things a little easier), it does seem like there's some jumpiness in a fade when I try to do it smoothly via a MIDI knob.Īs others unfortunately seem to be suggesting (in concert with more research I've done on my own), it does seem as though it's just a fact of cheap LED lights that the curve is pretty crude and the nature of LEDs is to make fairly discrete jumps in brightness. Then try with different software, then with a different computer and see if you can narrow down between the environment, vs the system and software, vs the usb-dmx device. Does it start at black and then consistently (albeit stutteringly) continue brighter and brighter, or does it flicker around to dimmer then back to brighter again before ending on white? I'd test by taking a single light, and connecting it to the system and try to control it. For example, say you were fading from black to white.
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When you fade do the colors move in the proper direction, or do they jump around. I would guess that you are either looking at an issue where the software/computer are getting bogged down and can't handle fading smoothly, or you have a driver/communication issue with the usb-dmx device.
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#UDMX DRIVER MAC MANUAL#
Looking at the manual for this fixture, it's 8 bit color only, and although low end dj fixtures are not going to give you the best fades, I think that blaming this on the fixtures is the wrong diagnosis at this point especially given that the demo mode on the fixture fades smoothly. (Similarly, is the Enttec Open DMX USB interface a fine option for me if I do need to spend my way out of this?)
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So, ultimately, before I invest in a slightly more expensive USB-DMX solution, I wanted to ask someone experienced with these things if it is indeed the cheap uDMX interface I have that's bottlenecking the refresh rate (or if there's a workaround). I tried Red Fine, Green Fine, and Blue Fine, but it just didn't seem to work at all. So, it's either the cheap USB-DMX cable (surprise, surprise) or maybe the lack of official fixture profile for my light? I've basically only been using 3-channel mode on the light and figured having Red, Green, and Blue color components would do the trick. I also suspect that Lightkey is completely capable of smooth transitions (and the very simple 2D visualization I have in this situation seems to suggest the same). Now, the built-in color cycle on the ADJ panel is very smooth, so I doubt it's the light itself. Pretty unpleasant (especially compared to what I'm going for)!
#UDMX DRIVER MAC MAC#
I'm using Lightkey on Mac going through the aforementioned uDMX into the ADJ panel, and when I create a sequence going between two color presets (even with a very long fade time), it's an extremely stuttery/stilted fade. I was hoping this subreddit could help me figure out where in my "chain" I'm having issues with smooth fades. I just bought an American DJ Profile Panel RGB and a cheap USB-to-DMX cable (which I've since found out is a uDMX unit) to get my feet wet in the world of lighting design.