There should be a convenient way to write long slurs

[UlyssesZh]

There are cases where there are like dozens of notes lying under a slur. Then, appending each note with a tilde is very inconvenient, like:

piano: c16~ d~ e~ f~ g~ f~ e~ d~ c2 | d16~ e~ f~ g~ a~ g~ f~ e~ d2

This is extremely inconvenient if at some moment I suddenly say "let's delete the slurs!" In this case, maybe we can design a function slur so that the code above is equivalent to

piano: (slur 'on) c16 d e f g f e d c2~ | d16 e f g a g f e d2~ (slur 'off)

(after (slur 'on), the notes without ~ are slurred while those with ~ are not slurred), or even something like

piano: [~ c16 d e f g f e d c2] [~ d16 e f g a g f e d2]

(just like how we write a long slur to cover a sequence of notes in sheet music).

[daveyarwood]

For practical purposes, you can use (quant 100) and it will sound exactly the same as if the note is slurred. For example:

piano: c8~ d~ e~ f~ g~

is effectively the same thing as:

piano: (quant 100) c8 d e f g

The default quantization value is 90, so if you want to "turn off" the automatic slurring, you can use (quant 90).

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All that being said, it might still be useful to add a "slur mode" that you can enable/disable with (slur 'on) and (slur 'off), or maybe something like (slur) and (/slur). This would be useful specifically for exporting an Alda score to a format like MusicXML that supports slurs, i.e. so that we can export to sheet music that has notes under long slurs.