Dr. Richard Boulanger wrote:

> PS.  Tito and I were exploring some of the "issues" associated with the tempo command in the score - perhaps he
> +would want to share these with the list.  There are
> some confusing things there too.

I think that the developers know this (and better) but alpha=0xff
for the transparency; here is my answer to the question about
"a simple value converter that the pre-processor/parser would be able
to interpret and convert to values in seconds based on set tempo and beat".

On Sun, Mar 11, 2012 at 7:08 PM, Tito Latini wrote:

> The problem is to get the tempo from the score. We see an example:
>
>  t 0 135 11 90 22 96
>
>  i1 0  1
>  i1 10 .
>  i1 20 .
>
> after scsort, we have
>
>  w 0 135 11 90 22 96
>  i 1 0.000000 0.000000 1.000000 0.454545
>  i 1 10.000000 5.454545 1.000000 0.656566
>  i 1 20.000000 11.957702 1.000000 0.630682
>  e
>
> the tempo has been applied and the w-statement contains the old
> temporal references (in the example 0, 11 and 22).

errata corrige: w-statement contains the temporal references in beats (like t-stmt)

>
> A possible but complex solution is to change the score parser for the
> w-statement:
>
>  1) insert the time envelope in a buffer (also to change the CSOUND struct)
>
>  2) rescale the times of the envelope
>
>  3) write an opcode to get the score tempo interpolating the value of
>     the current time in the envelope
>
> The simplest solution is a filter like `csbeats' for the new notation,
> usable with <CsScore bin="...">; whatever command with the syntax
>
>  command infile outfile
>
> can be used as a score filter in <CsScore bin="...">
>
> It is the point: to change CSOUND struct, score parser and add an opcode
> or to simply write a filter for the score. I think that the second
> doesn't cause flames.
>
> tito
>

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