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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

1129.0. "Synthesizing Multiphonics" by ANGORA::JANZEN (to cogitate and to solve) Thu Jan 07 1988 16:49

    Don't all of you answer at once, now.
    
    Can you synthesize woodwind multiphonics well on an FM synth with
    different waveforms capability, by modulating a tone with a square
    wave of frequency in the audio region?

    A woodwind multiphonic is a chord played on a single wind instrument
    such as flute (easy to get near-octave multiphonic intervals),
    clarinet (has lots of multiphonics), oboe and bassoon (the coolest
    and most complex multiphonics).  Wind instruments cannot play
    any chord at all; and the chords are usually disonant sounding.
    However, some attempt has been made to derive
    fingerings from proposed chords.  cf. the Bartolozzi New sounds
    for
    woodwinds (stop that EVE, I can hit my own CR!) and other books.
    
    I have mentioned before that I have gotten multiphonic like sounds
    from a TRS80 cassette port playing my synthesis program, and
    am going to look into it with the 11/23 program I'm using now
    (hear commusic iv), by trilling at audio frequency between two pitches.
    
    Multiphonics are also possible in voice and on a single string of
    a violin.
    Tom
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1129.1Parallel intervals get boringDFLAT::DICKSONNetwork Design toolsThu Jan 07 1988 17:5310
Yeah, you could probably do it, but why bother?  Just set up another voice to
track the same channel number, but with a transpose set.  Then you could set
this phantom voice to have any interval you want, and you can fully specify
what it should sound like.  (Let's see now.  I'll have the bassoon follow the
flugelhorn a minor third higher.  Argh.)  Of course, this would get you the
multiphonic effect on every note, but then so would the method you propose. 

There are some factory patches in the FB01 that sound two pitches at once: the
one you told it to play and another a fifth above.  Kind of spooky sounding,
but parallel fifths get boring real soon. 
1129.2no connectionANGORA::JANZENto cogitate and to solveThu Jan 07 1988 18:246
    You wouldn't use parallel intervals.  In wind music using multiphonics,
    the chord changes every note.  The instruments can't play aribitrary
    parallel intervals.  
    Multiphonics sound totally unlike two instruments playing in parallel.
    Recorders can do good multiphonics, too.
    Tom
1129.3Fake multiphonics via rapid freq changes.CTHULU::YERAZUNISHow about a 40 watt plasma rifle? Thu Jan 07 1988 18:4825
    My Tandy 2000 has a variation of the "munching bits" lisp machine
    demo that does something like what you want...
    	
    Here's a bastardized version:
        
    FREQ = 100   ; in Hz
    MASK = 1     ; just bits, no physical meaning
    
    DO [forever]                                 
    	F = MIN (FREQ, 80)
    	TONE (F)                       ;sounds a tone of F hz for 1/10 sec
    	FREQ = FREQ xor MASK
    	MASK = ( MASK + 1 ) MOD 4000
    END_DO
                  
    
    
    With the sound duration of 1/10 second, most people cannot tell
    that there is only one note playing at any one time.  It tends to
    sound very Bachlike.  For a few minutes.  There's enough order
    that your mind can sort of extract a theme and watch it evolve.
    
    Eventually, it gets boring.  But what do you want for ten lines
    of code, Wagner?
    	                                                         
1129.4or 32000 notesCOUGAR::JANZENto cogitate and to solveThu Jan 07 1988 19:374
    well, that's interesting.  I did things like that with the trs80.
    But it's not a trill.  Nevertheless, maybe I'll adapt for the 11/23.
    I think it could hold roughly 8000 four-note chords.
    Tom
1129.5Probably not what you're after, but interesting stillNAC::PICKETTDavid - reinventing baroque musicThu Jan 07 1988 19:468
    FM, hmmmm. Not sure, I don't do it yet. I've gotten some interesting
    results out of my ESQ-1 using the AM mode. This produces the sideband
    harmonics of a note, and the results can be interesting. 
    
    I'd like to hear some woodwind multiphonics. Any suggested listening??
    
    dp
    
1129.6non very definite helpTIGER::JANZENto cogitate and to solveFri Jan 08 1988 12:075
    I have a couple records.  If you see a record of new flute music,
    it
    probably (auto-CR strikes again!) has some on it.  There's a little
    reocrd with the Bartolozzi book.
    Tom