chinard

Yeah, i hear ya, but what you gonna do right? its not like they make them anymore, and korg DID switch to v/octave later on which just shows the irony of this decision. Regardless. that only covers pitch tracking anyways and has no bearing on the envelope control or lfo that i can (apparently) use just fine with an AOUT board. The only thing i'm not clear on is where to connect the AOUT in a 1 sid configuration with the full control surface (1xcore, 1xsid, 2xDOUT, and 3xDIN) and how to get it to send filter control voltages when desired to my external sources. (moogerfooger MF101 and afforementioned ms-20) I cant see this working to smoothly in a multiple sid configuration without some pretty creative mixer features and multple external filters.

well, i'm a bit sketchy on the details but i can explain the jist of it.. I may be totally wrong on the numbers here, but the basic idea should be correct. the way octaves work on a frequecy scale, each octave increment is a DOUBLING of the hz. for instance 440hz=note A4, 880hz=note A5, 1760hz =note A6, etc Hz/V is a linear pitch tracking where every time you double the voltage you double the hz. as you can see below the hz/v is a linear curve and the oct/v is a log curve hz/v 0-0.25 first octave (A=55hz) 0.25-0.75 second octave (A=110hz) 0.75-1.5 third octave (A=220hz) 1.5-3.0 fourth octave (A=440hz) 3.0-6.0 5th octave (A=880hz) oct/v 1v first octave (A=55hz) 2v second octave (A=110hz) 3v third octave (A=220hz) 4v fourth octave (A=440hz) 5v 5ht octave (A=880hz)

Yes there are 2 standards for pitch tracking with voltage control. There is the widely adopted V/Octave that was developed by R.A. Moog, and there was the lesser used V/Hz standard (korg, yamaha). The differnece is linear vs logarithmic tracking. The idea is that V/Hz provides better pitch tracking and is less suceptable to offset as components warm up. theres a pretty good wiki on the subject. http://en.wikipedia.org/wiki/Control_voltage Of course if you are just using volatge control to modulate something like a filter then pitch tracking means nothing and should work fine. So what you are saying is that i can make an AOUT board to send the applications envelopes and lfos to an external output like the ms-20 or moog filters i have? If so, how would i connect and configure it?

Helloooo I'm just getting started building my first generation of midibox/sid and i have a question in regards to using voltage control with external devices. My setup in my studio is starting to accumulate alot of analog machines including some moog stuff and a korg MS-20. I've been looking through the archives and i've seen alot of promising talk about people that built their own moog LP filter and have it working off the envelope control from the sid. Amazing project, but i've already got a moog filter (moogerfooger) so i'd like to figure out how to use that. From what i can see, it appears that alot of the DIN and DOUT modules use the +/- 5v standard which looks like it can control an external aparatus like a moogerfooger LP filter, or even a set of korg MS-20 HP/LP filters. This could even work for external modulation like with using the MS-20's freq~v converter and envelope follower. I've also seen that there is a midibox project for creating a CV gate so it looks like alot of the groundwork is already done here. I'm curious how one would go about wiring the CV inputs and outputs for something like this, and most importantly doing it in a way that would not impede the existing design. Another thing i'm wondering is since one of my external CV sources/destinations would be an MS-20 which is Hz/V instead of V/Octave, how i would be able to bridge between the two standards. (I believe the midibox is V/Octave much like the rest of the planet)