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Conference napalm::commusic_v1

Title:* * Computer Music, MIDI, and Related Topics * *
Notice:Conference has been write-locked. Use new version.
Moderator:DYPSS1::SCHAFER
Created:Thu Feb 20 1986
Last Modified:Mon Aug 29 1994
Last Successful Update:Fri Jun 06 1997
Number of topics:2852
Total number of notes:33157

553.0. "MIDIing Synths - 8 Voice to 6 Voice - Problems?" by AKOV68::EATON (PERSONAL_NAME="string") Tue Oct 28 1986 13:33

    	I have had little experience (actually none) using the wonders
    of MIDI.  I have owned two MIDI synths, but at separate times. 
    So I am curious about the following scenario as it will (hopefully)
    concern me soon.
    
    	What happens when one MIDI's an eight-voice MIDI component with
    a six-voice MIDI component?  Or for that matter, what does any
    incompatibility cause you?  If I were to use a six-voice synth as
    a controller sending to an eight voice slave, would it truncate and send
    only six to that module?  Are the note on messages linear, in that
    they just keep on transmitting despite what the master keyboard
    is capable of recieving itself?  Or do they send only what the master is
    able to understand itself?  Does this differ from keyboard to keyboard?
    If so, how does the MIDI implementation chart reveal this?
                                                                            
    
    	I have been trying to formulate plans for a next purchase and
    had planned to try finding a Juno 106 to MIDI to my CZ-101.  The
    Juno is six-voice while the CZ is eight/four voice (depending on
    patch).  Would a configuration like this present problems?  Should
    I avoid problems by looking more into the other eight/four voice
    units like the Poly-800 or the DX-100/27/21's?
    
    	Thanks in advance,
    
    	Dan
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553.1a start...GNERIC::ROSSuntitledTue Oct 28 1986 14:0228
    
    It can get very complicated, but if you limit discussion to
    ONE midi channel:
    
    Synths and kbd controllers will send out ALL note on/off messages
    that relate to the keys you press on that channel. There better
    not be exceptions to this(!). 

    You have to separate the note info "generator" from the sound
    generator. Its the sound generator that determines how to handle
    all those midi note on/off msgs according to various algorithms.
    
    Most quit after turning ON all their voices and ignore other
    messages, BUT some (Matrix-6R is one) have a "Spill over" mode
    that will send the "extra" note ons to another unit, I guess on 
    another channel(?).
    
    Again on ONE channel, you have a 6-voice and a 8-voice midi-ed
    to some controller. 6 note ons and the 6voice is 'full'. So too
    will the 8voice have 6 notes on...but it has room for 2 more
    notes.
    
    Maybe someone else will explain Midi "Modes" Poly, Omni and how
    that complicates the issue...
    
    ron
    
    
553.2but wait...GNERIC::ROSSuntitledTue Oct 28 1986 14:0911
    
    Oops. I think I may mislead you. Most(?) voice generators
    use an assignment algorithm that 'steals' a voice in
    order to accomodate a new note on msg when all voices
    are currently being sounded. So on a 6 voice when you
    play 7 notes, the last key down results in a new note
    sounding...get it?
    
    But there are exceptions. Help me out guys....  

    
553.3You'r Doin' All Right...ERLANG::FEHSKENSTue Oct 28 1986 14:208
    You've mostly got it.  Some synths just ignore incoming note-ons
    if all sound modules are "busy".  Some implement a "priority"
    scheme which may be user selectable.  The MIDIBass, an inherently
    monophonic synth, allows 4 choices - low note, high note, last note,
    first note.
    
    len.
    
553.4or something like thatGNERIC::ROSSuntitledTue Oct 28 1986 14:494
    Kurzweil has the most choices, but the only one
    not mentioned that I can think of is lowest 
    volume voice sounding at new attack time.
    
553.5I'm slow todayBARNUM::RHODESTue Oct 28 1986 15:246
All this rhetoric has me a bit confused.  What is the bottom line (or is it
unknown).  Can the CZ be midi-ed to the 106 without problems?

Todd.


553.625 or 6 to 4AKOV68::EATONPERSONAL_NAME="string"Tue Oct 28 1986 15:4014
    	Yeah, it's confused me somewhat, also.
    
    	What I would like to know, specifically is that if one uses
    the 106 (a six voice instrument) to drive the CZ (an eight voice
    instrument), when seven keys are depressed will the CZ play seven
    notes?  Or will it be limited to the six that the 106 recognizes?
    Does note-on info somehow pass through from the keys through the
    sound-generating module before it is passed out of the machine as
    transmitted MIDI data?  Or do the keys send simultaneous messages
    to the MIDI out DIN and the sound module of the master instrument?
    
    	Hope that makes it clearer.
    
    	Dan
553.7YESJAWS::COTEMOVB #^B10011101,B^MASKTue Oct 28 1986 16:1411
    From my experience the answer to your first question is "YES".
    
    My DX will operate as two 4 note polyphonic synths in the split
    mode. (Consider each half of the keyboard as a separate synth.)
    If I play 5 notes on one half, the DX plays 4 of them and my
    Mirage will play all 5.
    
    The note-on info appears to be independent from the sound generating
    info.
    
    Edd 
553.8guess I obfuscated.GNERIC::ROSSuntitledWed Oct 29 1986 08:2310
    
    Re -1 : 'Note info is separate from the voice generation.'
    
    Gee, guys, that's what we were saying all along...
    
    Glad it's confirmed for DX and Mirage.

    Anyone find an exception?
    
   
553.9Add Roland...JAWS::COTEMOVB #^B10011101,B^MASKWed Oct 29 1986 08:383
    Oh yeah, it also works when driving the JX3-P from the DX....
    
    Edd
553.10Yes, Yes, A Thousand Time YES!ERLANG::FEHSKENSWed Oct 29 1986 10:366
    My Juno-106 and CZ-101 are clearly compatible.  In general the
    keyboards send as many notes as you press; the synths play as many
    as they can.
    
    len.