Stretch on PI3 - No sound with timidity

[Echevresm]

Audio output is OK with many apps using the hdmi output, but with :

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timidity afile.mid

=> no sound

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timidity Ow -oafile.wav afile.mid

does outputs afile.wav, i.e. timidity actualy turns a midi file into a wave file, that's mainly its job and I can play this file with the alsa player.
If I try to direct the output to alsa :

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timidity -Os afile.mid 

I don't get any more sound and I have to kill timidity. Same issue even if I launch the alsa daemon. Same issue again with others soft synths, except Sonic Pi.
It seems to be an alsa problem. Timidity works well with Jessie. Any idea ?