I am running a pure data patch that uses Sigmund~. I have found, emperically, that to avoid underuns I need a block size of 128. However, Bela appears to perform poorly, on boot, with these settings, giving a stream of underuns and a very glithcy sound. When I then start the patch from the IDE it works faultlessly.

Any ideas what is going on?

for the settings to be applied at boot, you need to:

  • open the project "yourProject"
  • set the desired settings
  • set project to run on boot : "•none•"
  • set project to run on boot: "yourProject"

Basically, every time you change the settings, in order for them to be applied you need to do the last two steps.