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Automatic piano reduction

Perhaps you'd like a 4-part vocal piece written on 4 separate staffs, as well as a piano reduction on two staffs with 2 voices. This could be done using:

score
   staffs=6
   bracket=1-4
   brace=5-6
staff 3
   clef=treble8
staff 4
   clef=bass
staff 5
   vscheme=2o
   staffscale=0.75   // make piano staffs a little smaller
staff 6
   clef=bass
   vscheme=2o
   staffscale=0.75

// Define macros to put each voice on its own staff
// plus the appropriate staff/voice of the piano staffs.
define S 1 1 & 5 1: @  // soprano
define A 2 1 & 5 2: @  // alto
define T 3 1 & 6 1: @  // tenor
define B 4 1 & 6 2: @   // bass

music
S 2c+;;
A 2f;e;
T 2a;g;
B 2c;;
bar

Picture of Mup output

This can also be done using chord-at-a-time input style:

// Define a macro to put each voice on its own staff
// plus the appropriate staff/voice of the piano staffs.
// This example assumes inputting notes from bottom to top.
define M [ 4 1 & 6 2; \
           3 1 & 6 1; \
           2 1 & 5 2; \
           1 1 & 5 1 ] :   @

music

M 2cafc+;cgec+;
bar


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