>> In this example the first two notes of the bass should synchronise
>> with the first two notes of the treble. And they do. My question was
>> what to do in a more complicated situation.
> What with the rest of the bass? It ends in a half note. The melody
> ends in a full bar rest. Where should that half note align to?
>>>> What I mean is that in some music the end of the 'free rhythm' section
>>>> may need to be synchronised with the other staves. For instance, at
>>>> the end of a florid passage for a soloist in free rhythm, the last few
>>>> notes may need to coincide with an accompaniment. The \cadenza
>>>> keywords don't seem to handle this. Would you like an example or have
>>>> I explained it well enough now?
>>> You posted an example. What in the bass of the example should
>>> synchronise where?