From SCSTRAUS@teletechusa.com Tue Dec 12 17:28:39 1995
Date: Tue, 12 Dec 1995 16:59:29 -0700
From: SEAN STRAUS <SCSTRAUS@teletechusa.com>
To: scstraus@wonderland.teletechusa.com
Subject: Re[2]: MIDIizing analog effects units -Forwarded

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Return-receipt-to: PMosinsk@lmumail.lmu.edu (Peter Mosinskis)
From: PMosinsk@lmumail.lmu.edu (Peter Mosinskis)
Subject: Re[2]: MIDIizing analog effects units
To: Sean Straus <scstraus@teletechusa.com> 
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     >It seems like it may be similar to an expression pedal 
     >(like the ones on some Digitech MIDI floor pedal units).  Is there 
     >something I'm missing?
     
     You're right, that's exactly what I want to be able to build, but I 
     just want a stand-alone pedal; most of those Digitech or Art boards 
     have MIDI switching as well, and I just want something that I can 
     build inside of a footpedal (like a wah, etc.)
     
     Sean, how familiar are you with digital electronics?  Like I said, I 
     am not very familiar.  From what I understand there is a Motorola 
     microcontroller IC series called the 68HC11 series which are really 
     suited for MIDI applications.  Apparenty, MIDI is sent and received as 
     a serial stream of information.  You may be able to use another chip 
     which sends and receives RS232 information; I thinks that's what the 
     68HC11 does, but it is able to send MIDI information at a very high 
     baud rate (higher than standard RS232), which is necessary to achieve 
     real-time/almost instantaneous changes in whatever MIDI parameters you 
     are modifying.
     
     If I'm correct, the chip itself costs about $20? or so (I could be way 
     off).  They're not easy to find, either.  I think I may be able to dig 
     up some info regarding places that sell this if you are interested.  
     Then of course, you'll need a A/D converter for your particular 
     application (could be $10-30), a D/A (similar $$$), and additional 
     parts.  Not too cheap by any means, but certainly interesting.
     
     I guess step one is to get the MIDI standard book, figure out how MIDI 
     sends and receives info, program the microprocessor (this part TOTALLY 
     escapes me) to work along MIDI lines, and build the circuit.
     
     Sounds easy enough, no?  ;)
     
     Regards,
     
     Peter.