Quadruplets in 9/8

[John Watson]

I have a strange VexTab bug

The following two lines of notes are identical.  The second displays the score properly, the first one does not.

stave notation=true clef=treble key=G time=9/8

notes | :q B/4 :8 B/4 :q T B/4 :8 G/4 :q A/4 :8 F/4 | :8 G/4 :8 F/4 :8 G/4 :8 A/4 ^4,4^ :8 G/4 :q E/4 :q D/4 :8 D/4 |

stave notation=true clef=treble key=G

notes  :q B/4 :8 B/4 :q T B/4 :8 G/4 :q A/4 :8 F/4 | :8 G/4 :8 F/4 :8 G/4 :8 A/4 ^4,4^ :8 G/4 :q E/4 :q D/4 :8 D/4 |

The only difference is between the staves, where the second stave has an implicit time signature.  If I make the two stave definitions identical, then both staves are displayed in error. 

Any ideas?

[Mohit Muthanna Cheppudira]

Yes, this is sort of a bug (in the spec, not the code.) Right now if you don't specify a time signature, it simply assumes 4/4. If you do, it always renders it. What we need is an option to set the time signature, but not render it.

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Mohit Muthanna [mohit (at) muthanna (uhuh) com]

[John Watson]

OK - thanks again, Mohit.

I think this indicates two errors doesn't it?  Firstly the error in the spec that you mention.  But secondly an error with the beaming implementation - when there is an explicit triple time signature, the beaming of the quadruplet is incorrect because it captures 5 notes rather than 4.  (Double time appears to be OK.)

On Tuesday, 27 September 2016 15:16:36 UTC+1, Mohit Muthanna Cheppudira wrote:

Yes, this is sort of a bug (in the spec, not the code.) Right now if you don't specify a time signature, it simply assumes 4/4. If you do, it always renders it. What we need is an option to set the time signature, but not render it.

On Tue, Sep 27, 2016 at 5:34 AM, John Watson <music...@gmail.com> wrote:

I have a strange VexTab bug

The following two lines of notes are identical.  The second displays the score properly, the first one does not.

stave notation=true clef=treble key=G time=9/8

notes | :q B/4 :8 B/4 :q T B/4 :8 G/4 :q A/4 :8 F/4 | :8 G/4 :8 F/4 :8 G/4 :8 A/4 ^4,4^ :8 G/4 :q E/4 :q D/4 :8 D/4 |

stave notation=true clef=treble key=G

notes  :q B/4 :8 B/4 :q T B/4 :8 G/4 :q A/4 :8 F/4 | :8 G/4 :8 F/4 :8 G/4 :8 A/4 ^4,4^ :8 G/4 :q E/4 :q D/4 :8 D/4 |

The only difference is between the staves, where the second stave has an implicit time signature.  If I make the two stave definitions identical, then both staves are displayed in error. 

Any ideas?

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[John Watson]

Actually I was wrong - the problem also exists with double time.  I notice, too, that the tuplet is labelled 4:2 which implies (to me) 4 notes in the time of 2 whereas we need 4 in the time of 3.  I wonder if the tuplet syntax is lacking which only allows two parameters?  ABC notation, for example, defines tuplets as p:q:r -  p notes into the time of q for the next r notes.