[sdiy] Data transfer?

Chris Crosskey chris.crosskey at vicon.com
Thu Aug 15 09:50:28 CEST 2002

I'd suggest you talk to Paul Maddox,

He's done all this sort of stuff in his Monowave design already I
think....what you'd want is a Monowave oscialltor section in a box....but
you might as well go an dbuy a whole one as you get a Moog VCF and the truly
awesome VCA that I helped design :-)


> -----Original Message-----
> From: The Proteus [mailto:proteus at ugwarehouse.org]
> Sent: 15 August 2002 08:02
> To: Synthesizer DIY List
> Subject: Re: [sdiy] Data transfer?
> 	Well, I don't want to get bogged down into a lot of file format
> stuff - that's what's making any type of downloadability or
> programmability such a deterrant to me, but to have this nice dual
> oscillator sitting in front of me (as a user), with up to 256 wave
> segments and programmable crossfade between each segment and no way to
> customize and store my own presets (yes, the evil word) just gets me.
> 	It seems that this could be split into two separate lines of
> discussion: 
> 1. How does one design a successful, simple, modular-style 
> (buttons and
>    knobs) user interface for such a complicated beast?
> 2. Is it desirable, and if so, what medium would be 
> appropriate for preset
>    interchange in the box.
> To whet people's appetites, here's roughly what I've got planned:
> - Dual Wavetable VCO that will support from 1 to 256 waveforms in 
>   a single sequence.
> - Fits in a SynthTech 2U or 3U module (pending Paul's permission... I 
>   haven't asked yet if it's okay to defile his analog domain 
> with digital
>   interpolation!) :-)
> - Standard Gate / Trigger / CV in for note on and ADSR, as 
> well as Linear
>   FM input, Wavetable sweep, and Wavetable trigger
> - Unit can be configured as either a Dual mono or single 
> stereo VCO, with
>   CV in for pan control in mono mode.
> Beyond that, I've got a laundry list three pages
> long. :-) Architecturally, there will be a pretty simple CPU 
> controlling a
> custom interpolator chip I'm designing which has a large 
> amount of SDRAM
> hanging off of it. The CPU will also be responsible for 
> converting the CV
> and gate signals and interfacing to the front panel. If I'm really
> interested in taking the time to do so, and the CPU I pick 
> has an onboard
> UART I just might squeeze in a MIDI to CV converter as well.
> See below for replies.
> - - - T h e  U n d e r g r o u n d  W a r e h o u s e - - -
> - - - Subversive - Tools - For - A - Chaotic - Planet - - -
> -  h t t p : / / w w w . u g w a r e h o u s e . o r g /  -
> --<T h e  P r o t e u s>-<Musician>-<Producer>-<Engineer>--
> On Wed, 14 Aug 2002, Byron G. Jacquot wrote:
> > You might want a CV input for the wave crossfade...then a 
> sequence of
> > crossfades could come from MIDI-CV, or any other modules.  
> I'd like to be
> > able to tweak it with an ADSR, at the very least.
> Already on the list. What good is a modular wavetable 
> oscillator when you
> can't tweak wavetable crossings?
> > Smartmedia is relatively easy to implement with a 
> microcontroller...at least
> > to some degree.  The problem is that it want's to be 
> written with a DOS
> > FAT-12 file system.  All of the desktop interfaces will 
> probably prevent you
> > from doing direct block-level reads/writes.
> Yeah... this is the crux of doing anything such as CompactFlash,
> SmartMedia, and the like. The biggest problem for me is 
> writing the host
> PC application if you want to transfer wave sequences between 
> the modular
> and PC, or if you want to design a patch on the PC. Best bet 
> for me would
> be to do a SoundDiver adaptation. :-) I have been naively 
> toying with the
> idea of using a Cypress Semiconductor 8051 based USB 
> controller, then hook
> the thing up via USB, but once again the host application is the
> hinderance here... I don't want to spend 4 months writing a 
> damn Windows
> and MacOS app to talk to an oscillator. 
> > There are some small 8-pin DIP EEPROMS that use a 3-wire 
> interface.  You
> > could make data cartridges around them, then build a small 
> burning station,
> > maybe RS232 to 3-wire...something akin to an EPROM burner or the old
> > Oberheim Prommer.  Or is that too close to a Synergy?
> Cool idea, but once again the host interface issue is blocked 
> by writing a
> host app. Maybe it would be best to just have MIDI->CV on 
> this box and do
> controller and sysex to it. Hrm. 
> Regards and thanks,
> Prot

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