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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

1009.0. "Yamaha DX7 - Mapping Volume to Aftertouch (Pressure)" by MARVIN::MACHIN () Mon Nov 09 1987 13:00

    
    I'd like to patch volume through to aftertouch -- this seems
    to me to be a useful thing to do. How do you do it/simulate it?
    
    Richard.
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1009.1Which way was that?MAY20::BAILEYSteph BaileyTue Nov 10 1987 16:576
    Do you want to control the ``after touch modulation'' with the volume
    controller, or do you want to use key pressure (aftertouch) to control
    the volume?
    
    Steph
    
1009.2Aftertouch controls volumeMARVIN::MACHINWed Nov 11 1987 07:054
    I want the note to get louder as I increase pressure on the key.
    
    
    RIchaRD.
1009.3I find the DX hard to control in this way, but...MAY14::BAILEYSteph BaileyThu Nov 12 1987 13:0622
    Fortunately, this is (relatively) easy.
    
    Set the amplitude modulation sensitivities of each of the carrier
    ops to a non-zero value (3 is max).  Set the EG BIAS bit of the
    Aftertouch function to ON, and set the modulation depth of the
    Aftertouch function to something non-zero.
    
    With everything maxed out (AM=3, After depth = 99), you will get
    full-scale control over the volume.
    
    Did you know that the actual resolution of the modulation depths
    is only 0-15?  That 0-99 stuff is hogwash.
    
    
    Note that this only works if you aren't using the LFO to modulate
    amplitudes, otherwise you will ``cross wires'' but I'm sure you
    can figure that out.
    
    Steph
    
    
    
1009.4Hogwash? Please ClarifyNYMPH::ZACHWIEJAOne step from sanity.Thu Nov 12 1987 17:057
>   Did you know that the actual resolution of the modulation depths
>   is only 0-15?  That 0-99 stuff is hogwash.
    
    Do you mean that 0=0 and 15=99,  or do you mean that 0=0, 15=15,
    and 16-99 is wasted ?
    
    Zach
1009.5The resolution is wasted.ACORN::BAILEYSteph BaileyFri Nov 13 1987 15:546
    Actual value := (15/99) * Input Value
    
    (That is, the former).
    
    Steph