fzero - I may have missed something with your rack - I tried something similar myself. It does work and probably doesn't make much difference in a performance situation, but I was looking for something which sweeps the whole spectrum as a low pass on one side of the knob (MIDI 0-63) and then sweeps the whole spectrum as a high pass on the other (MIDI 64-127).
That's what so clever about cjyetman's rack. Although you can't change the resonance like you've done with yours.
Yeah, I noticed the low-pass sweep problem after I uploaded it.
The problem with the other rack is that it clicks horribly towards the bass when you turn the knob too fast, probably because of the layer-switching.
Soooo... I'm trying to attack the problem in another way now. I created a VST effect in Synthedit that does exactly what we need. It still needs some cleaning up, but there's a beta version here:
Unfortunately it's for Windows only, but it's a start. Right now there's some small glitches, but I think I'll nail them soon.
I uploaded a new version which deserves the "stable" label. It sounds pretty nice and sweeps smoothly. There's still a minor glitch: if you turn the resonance up too much (just about over the middle) it's possible to notice when the filter changes from lo-pass to hi-pass. Mind you, with the reso knob at minimum there's already
some resonance (added to mimic DJM800's sound) and the sweep is perfectly smooth. On the other hand, turn it all the way up to go almost into self-resonance (it squeals!!!). You can drop the effect on a channel while it's playing without any noticeable changes to the sound (a must for maniacal drag'n'droppers like me).
I think the only thing that's really missing is a nicer GUI with a big knob... and maybe a saturation control to add some dirt if needed.
Oh, and did I mention it's open-source? The zip now includes the Synthedit source file for you to do whatever you please, as long as you release your version with the source too (yep, it's GPL). Enjoy!