Is there a limit for the number of channels in writesf?
(I would like to write say 96 up to 256 channels.)

@Gustaw 64.
It could be possible to combine multiple [writesf~] and so write multiple 64 channel files, and then combine them externally in a DAW or some other software. WAV format allows 65535 channels.
If you want to read your file back into Pd it looks as though [readsf~] can read 256 channels or more.
David.

Thanks a lot for the information whale-av!
64 channels is not bad at all. Good enough for demonstration purposes.

If I wnta more channels it might also be the possibile to dac them all and capture from ALSA with a DAW.

@Gustaw I have [dac~] running 32 channels regularly, but 64+ I have never tried.
I have come up against a 64 limit for IP addresses with MrPeach netsend objects as well, which surprised me.
Let us know how you get on with [dac~] 64+......
David.

@whale-av Thanks the help.
I am a noob at pd, but learning quickly. It is a fascinating tool,

I am modeling sound from ships and similar vessels mixed with environmental noise. Output is hydrophone signals from an array of hydrophones. It works like a charm for 10 hydrophones at std audio rate without excessive CPU load, so I figure I can increase this number quite a bit without dropouts.

I'll keep you informed but it will take a while, this is a spare-time project.