# preserving ties when querying omn :length

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Hello,

For various reasons, I need to start with rhythms defined in one time signature and remap them. I'm having trouble doing this because of what happens to ties when you use omn :length (though I realize they are being collected under :articulation).

In this case, I'm taking bars of 4/4 regrouping into bars of 2/4.

```(setf myr '(
(s s -s s -e s s -s s -e t t t t s s)
(e e_q -h)))

(setf tr (omn-to-time-signature myr '(2 4)))```

Now I take the result of the above and assign it to a new variable ( this would be the same as (setf foo tr) ):

`(setf foo '((s c4 c4 - c4 -e s c4 c4) (-s c4 -e t c4 c4 c4 c4 s s) (e c4 c4 tie q) (-h)))`

As you can see, there is a tie in the third bar.

Now, how can I extract that rhythm so that I can apply to another set of pitches?

If I do the following, I no longer have the tie represented in the rhythm:

```(omn :length foo)

;; results in
;; ((1/16 1/16 -1/16 1/16 -1/8 1/16 1/16) (-1/16 1/16 -1/8 1/32 1/32 1/32 1/32 1/16 1/16) (1/8 1/8 1/4) (-1/2))
;; i.e., no tie in the third bar```

Also, if I try to span the rhythm onto another set of pitches, I again get a result that is missing the tie:

```(setf my-pitches '(c4 d4 e4))
(make-omn :length foo :pitch my-pitches)```

What I'd really love is to get back a list of lengths that is like my original list, just regrouped in new time signatures. So, ideally something like:

```(setf myr '(
(s s -s s -e s s -s s -e t t t t s s)
(e e_q -h)))

;; imaginary function
(regroup-to-two-four myr)

;;would result in the following:
;;  ((s s -s s -e s s)(-s s -e t t t t s s)(e e_q)(-h))```

Finally, I should add that in a related problem, I need to extract the number of attacks in a bar after it has been regrouped. So, for this reason again, I need to figure out how to extract the rhythm while preserving ties and not re-attacking tied notes.

I'd very appreciate and thank you kindly for any assistance in doing this.

Thanks very much, Michael

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Ah, looks like omn-merge-ties is my friend here...

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