lisp is idle for some minutes and I have the code for an efficient `fout'.
With the current version we have `kr' sf-write-calls in 1 second.

Here I use the follow value for the buffer size:

  (int(512 / ksmps) + 1) * ksmps * fout_channels

if ksmps < 512, and

  ksmps * fout_channels

if ksmps >= 512.

sf_write is called when there are at least 512*fout_channels samples in
the buffer, if ksmps < 512, or ksmps*fout_channels samples if ksmps >= 512.

In this way we have max `sr/512' sf-write-calls in 1 second.
With sr=44100, ceiling(sr/512) = 87.

Added also `fout_flush_callback' to write the possible not empty buffer at
the end of the instance.

If you think that it is good, I'll also change `foutk' and git-push tomorrow.

tito

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