Hi Matt,

I gave a quick glance at your code and it has has some issues.
It is not a good idea to make outlet calls from the perform routine.
Read the chapter "Anatomy of a MSP Object" from the Max/MSP SDK.
You want to create and use a clock to schedule outlet calls from the high priority thread.
Since a clock_delay() function will be called from the perform routine, you also need to pay attention not to clog the scheduler by calling the function too often, especially at small vector sizes.
Going from the audio thread to the scheduler thread is not trivial in complex scenarios.
Your scenario is not very complex but you need to take care of a few important things.
I am sorry for being so general, but I don’t have time to go into specifics right now…
Maybe someone else may be able to go more in depth…

Hope this helps somehow.
Take care

– Luigi