follow-up to this post where you'll find the specs. "Just a quick demo to show this awesome iPad application. The StepPolyArp iPad application hooks up wirelessly to a Windows or OSX computer. I currently have the StepPolyArp app talking with Logic Pro that then drives a Doepfer MCV24 to go from midi to CV and Gate. The Oberheim is being triggered in Unison for all 4 Voices on every step. Each voice is being panned right/left to create a nice stereo effect with a total of 8 oscillators.
iPad STEP POLY ARP Preview! Control your synth wirelessly
VJFranzK | October 12, 2010
"Control your laptop or synth by wireless MIDI! Full review coming soon...
This app transmits note patterns wirelessly to your computer*, or soon, via MIDI cable, with the MIDI Mobilizer peripheral, to any MIDI capabable source. (*Of course you can also then route the MIDI through your computer to any MIDI out port.)
I thought there should be an App that does this... and here it is! Very handy for the serious electronic musician. (Beginners should probably start on one of several "all in one" apps - not that there's anything wrong with that!)
The set up was easier than any wireless control app I have tried. Just follow the directions (more general in focus than the 2 Ableton specific Apps, much easier to set up and feature rich than the OSC apps.)"
YouTube via MOTMguy | October 12, 2010 follow-up to this post "Another demo by Terry Ahrens showing laser galvos connected to a Synthesis Technology E350 Morphing Terrarium. Module info is here: http://www.analoguehaven.com/synthesi..."
via Paul Schreiber on the AH list: "Note that when Terry mentions "..the E350 is the filter..." this is referring to what is used to drive the galvos (the E350 os a VCO in reality). Normally, envelope-detected audio is used as the "filter" and the galvos are swept by quadrature triangles (like a CRT raster sweep).
For those interested in replicating this setup: I will ask what galvos he is using and what they cost/where to buy. Note several important things:
a) in the US, this sort of laser projector CANNOT be used in public unless under very STRICT requirements. b) professional "off the shelf" XY galvo pairs w/drive electronics and power supply can run $1500. The galvos can require 3A peak each, and the moving mass/inertia is large. The galvos are usually mounted on 1/4 in steel plates (called optical plates) and then inside a matte black steel box weighing 10kg/25lbs to keep vibration 'errors' to a minimum. The box keeps spurious laser deflections from "flying around the room" . These galvos are also very fast and very accurate: they can move to 30,000 individual positions per second (the mirrors usually have 45-55 degrees total travel) at 0.05 degree accuracy.
Thanks again to Terry Ahrens for setting this up and making the videos.
via this auction
output of the oscillators are summed together and inter-(ring)modulated into a
