MPD crashed when using UPnP

[Nutul]

So I tried yesterday to modify resource allocation in MPD settings: Audio Buffer to 64 MB, Output Buffer to 512 MB, Max queue items to 32768 and Input cache to 1 GB.

Sincerely

François

Do you mind pointing me to where to find out how to do those changes? 
(Background is that I am battling with moOde on a RPI zero w and I am also seeing crashes and a freezing Web GUI all while streaming 16/44.1 via UPnP)
i.e.

Code:

alsa_output: Decoder is too slow; playing silence to avoid xrun 

You can look into Configuration => MPD, at the bottom of the page.