Re: String pressure notation

[Aaron Hill]

On 2024-04-14 8:45 pm, Richard Davis wrote:
> Ideally I'd want to be able to anchor specific levels along this 
> spanner
> to rhythmic events, perhaps by specifying "levels" of pressure like so:
>
> {
>   c4\startBowSpan 0.0 c4\pressure 1.0 c4\pressure 0.5 c4\stopBowSpan 
> 0.0
> }
>
> In my head, whatever implementation this requires would somehow
> "collect" these levels and generate the final shape as
> necessary. However, I don't know nearly enough scheme to even know 
> where
> to begin on this. The reddit contributor to the original did suggest
> using DynamicLineSpanners may be more productive, but I also don't 
> quite
> understand how to go about that.


Hi, Richard.  I was the one helping you on Reddit.  I think the best 
option is to create a custom grob and engraver for this type of 
notation.  In fact, a more generalized continuous controller notation 
(with MIDI output) would be ideal, and bow pressure could just be one 
special form.  I started investigating going down this path, but I ran 
into some time constraints due to some personal health issues.  But I 
know there are several folks on the mailing list that have experience 
with creating custom grobs and engravers.  If they have the availability 
and interest, I am sure they can help get you to a better working 
solution than the one I threw together.

By the by, my comment about the DynamicLineSpanner was because I 
consider this type of notation to be akin to any other standard dynamics 
indication.  One would probably want all of these pressure indicators to 
vertically line up with each other, so I was thinking the Dynamics 
context would be the eventual home.


-- Aaron Hill