Programming Sound Cards/Programming Sound Cards.iso/sound_52/ex1.ma

Text File | 1995-01-01 | 7KB | 387 lines

#
#
# Illustrates idea of using continuous controllers to
# implement pan between speakers
#
# four vcos used.
#
# 2 for melody
# 2 for pan control
#
# true setup
#
#    vco melody on channel n
#    vco melody dupped on channel n+1
#
#    vco pan control 1
#        volume messages to channel n
#
#    vco pan control 2
#        volume messages to channel n+1
#
# mos setup should map vco 4 to vco 2
#               vco 3 to vco 1
#
# Mixer should have one vco to the left, one to the right.
# Set pan to hard left and hard right appropriately.
# Basic idea is that volume is continuously balanced by
# ccont messages on left and right; i.e., strong on left
# weak on right then move gradually to weak on left
# strong on right; apparent voice position will shift.
#
# This takes an input argument from mos
# e.g.,
#
# mos> set argv 3
#

PORTAMENTO = 5
VOLUME = 7
PAN = 10
SUSTAINPEDAL = 0x40

PANLEFT    = 127
PANRIGHT = 30

TRUE    = 1
FALSE    = 0

# pan control variables, one per channel
#
int vol1
int vol2

# debug on/off
int debug=TRUE

# minor scale offsets, jazz minor
#

uchar minor[7]={
    0,2,3,5,7,9,10
}


# major scale offsets, jazz major
#
uchar major[7]={
    0,2,4,5,7,9,11
}

# chord progression
#
uchar basis[9]={
    E,LE,E,G,LG,B,LB,D,LD
}

uchar notesPerRiff[9]={
    6,12,6,12,12,6,3,9,12
}

uchar riffsPerBasis[10]={
    2,4,6,6,8,6,4,4,2,4
}

int tottime

int panvalue

int octave=0

riff settime(beats,beatnote)
    tottime = beats * beatnote
end

riff nexttime()
end

riff atoi(vector string)
    int i
    int n

    for( i = 0; ; )
        if ( string[i] == ' ')
            i++
        else
            break
        end
    end
    for ( n = 0; string[i] >= '0' && string[i] <= '9'; i++)
        n = 10 * n + string[i] - '0'
    end


    return(n)
end

# move from current chord to next chord in progression
#
riff nextBasis(cur)
    if ( cur == 9 )
        return(0)
    end
    cur++
    return(cur)
end

# determine how many notes for this riff
#
riff nextNotes(cur)
    return(notesPerRiff[mrand()%9])
end

# determine how many riffs for this chord
#
riff nextRiffs(cur)
    return(riffsPerBasis[triangle(0,9)])
end

LOSTRINGS = 4
STRINGS = 5
EGRAND = 8

int newport
int newsustain
int newpatch
int disturbFlag = FALSE
int resttime
int restflag = FALSE

riff disturbMelodySetup()
    int rno

    disturbFlag = TRUE
    # must force a time switch, rest at end of chord
    # change doesn't hurt either. time switch needed
    # for 2nd voice to imitate
    resttime = mchoose(q,e,q+e)
    restflag = TRUE
    rest    resttime

    rno = mchoose(0,1)

    if (rno)
        newpatch =  mchoose(LOSTRINGS,STRINGS,EGRAND)
        if (newpatch == LOSTRINGS)
            octave = 12
        else
            octave = 0
        end
        patch newpatch
        newport = mchoose(0,0,0,0,5,10,10,15)
        ccont 0     PORTAMENTO    newport
        newsustain = mchoose(0,127)
        ccont 0  SUSTAINPEDAL    newsustain
        if (debug)
            void printf("newpatch %d\n",newpatch)
            void printf("newport %d\n",newport)
            void printf("newsustain %d\n",newsustain)
        end
    end
end

riff disturbDoppelGanger()
    rest resttime
    disturbFlag = FALSE
    patch newpatch
    ccont 0 PORTAMENTO    newport
    ccont 0  SUSTAINPEDAL    newsustain
end

int rno
int nnote
int ntime
int nvel

riff playIt(nn,nt,nv)

    rno = mchoose(0,1,2,3)
    nnote = nn+octave
    ntime = nt
    nvel  = nv

    if ( rno == 0 )
        nnote    nt    nv
    else if ( rno == 1 )
        nnote-12    0,nt    nv
        nnote    nt    nv
    else if ( rno == 2 )
        nnote-12    0,nt    nv
        nnote-5    0,nt    nv
        nnote    nt    nv
    else if ( rno == 3 )
        nnote     nt    nv
    end

end

riff imitate()
    if ( rno == 0 )
        nnote        ntime    nvel
    else if ( rno == 1 )
        nnote-12    0,ntime        nvel
        nnote        ntime    nvel
    else if ( rno == 2 )
        nnote-12    0,ntime        nvel
        nnote-5        0,ntime    nvel
        nnote        ntime    nvel
    else if ( rno == 3 )
        nnote        ntime    nvel
    end
end

# @include pan1.ma

riff vco1sect1()
end

riff vco2sect1()
end

riff vco3sect1()
end

riff vco4sect1()
end

# melody
#
vco melody
    int curbasis         # current chord in progression
    int curnotes        # number of notes in riff
    int curriffs        # riffs per chord
    int cr            # current riff index
    int cn            # current note index
    int rno            # random number variable
    int scalemode        # major or minor mode index
    int newnote
    int newtime
    int newvel

    # pass per ccont pan time in from mos argv
    # environment pointer
    #
    panvalue = atoi(&argv)
    if (panvalue == 0)
        panvalue = 5
    end
    void printf("panvalue = %d\n",panvalue)

    void vco1sect1()

    # section two


    # section three
    scalemode = mrand() % 2
    for( curbasis = 0; ; )

        curriffs = nextRiffs(0)

        #
        # for some number of riffs
        for( cr = 0; cr < curriffs; cr++)
            # for each riff play some number of notes
            #
            curnotes = nextNotes(0)
            newvel = mrandrange(90,100)
            for( cn = 0; cn < curnotes; cn++)
                rno = mfractal1(rno) %  7
                if (scalemode)
                    newnote =  basis[curbasis] + major[rno]
                else
                    newnote =  basis[curbasis] + minor[rno]
                end
                newvel = newvel + 5
                if ( newvel > 120 )
                    newvel = 89
                end
                newtime = mchoose(q,e,s,s,s,s,s,s,e,e,e,e,q+e)
#                 void printf("%d %d %d\n",newnote,newtime,newvel)
                void playIt(newnote,newtime,newvel)
                newnote newtime newvel
            end
            # sometimes throw in a rest
            #
            rno = mrand() % 3
            if (rno)
                resttime = mchoose(q,e,e,h+q,e,q+e)
                rest resttime
                restflag = TRUE
            end
        end
        curbasis = nextBasis(curbasis)
        # flip coin to decide if major/minor mode
        #
        scalemode = mrand() % 2
        void disturbMelodySetup()
    end
end

vco melodyDup

    void vco2sect1()

    # section three
    for(;;)
        #void printf("v2 restflag %d\n",restflag)
        if (restflag)
            restflag = FALSE
            rest resttime
        else
            void imitate()
        end
        if (disturbFlag)
            void disturbDoppelGanger()
        end
    end
end


vco pan1
    int decflag
    int mcount
    int vol
    int dirflag

    void vco3sect1()

    # force pan control to left channel, mixer must be setup to
    # match
    vol1 = PANLEFT
    vol2 = PANRIGHT
    for(;;)
        if (vol1 >= PANLEFT)
            void printf("PAN LEFT max %d %d\n",vol1,vol2)
            decflag = TRUE
        else if (vol1 <= PANRIGHT)
            void printf("PAN LEFT min %d %d\n",vol1,vol2)
            decflag = FALSE
        end
        if (decflag)
            vol1--
            vol2++
        else
            vol1++
            vol2--
        end
        ccont    panvalue    VOLUME    vol1
        #void printf("vol1 %d ",vol1)
    end
end

vco pan2
    int mcount
    int vol
    int dirflag

    void vco4sect1()

    # force pan control to right channel, mixer must be setup to
    # match
    for(;;)
        ccont    panvalue    VOLUME    vol2
        #void printf("vol2 %d\n",vol2)
    end
end