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## Special uses of invisbar

The "invisbar" can be used to force Mup into doing something in the middle of a bar that it normally would allow to happen only at a bar line. Suppose, for example, you wish to place a rehearsal letter in the middle of a measure. This could be accomplished as follows:

    // assume we are in 4/4 time, but want
    // a rehearsal letter by count 3
    // of the measure

    // do first part of measure and use "space"
    // for last part so time values will add up
    // properly to a full measure
    1: 4c;d;2s;

    // put in invisible bar with rehearsal letter
    invisbar rehearsal let

    // now do the last half of the measure,
    // this time with space at the beginning
    1: 2s;4e;c;
    bar

As another example of invisbar use, suppose you want to add a "courtesy" key signature at the end of a repeated section to remind the player that the beginning of the repeated section is in a different key. This can be done by adding an empty measure whose sole purpose is to produce this key signature.

    score key=3&
    music
    1: g;f;e;d;
    repeatstart
    1: c;e;f;g;
    dblbar
    score key=0&
    music
    1: g;f;e;d;
    bar ending "1."
    1: f;e;2c;
    // add a courtesy key signature,
    // to remind player the beginning
    // of the repeated section is in
    // a different key
    invisbar
    score key=3&
    music
    1: ms;
    repeatend ending "2."
    1: e;d;2c;
    endbar

You can use a similar technique to insert time signatures, clefs, etc. at unusual places.

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