You could probably route your voice through an audio processing software via Sunflower, Blackhole or Loopback.

Loopback is paid software but it'd seem they have this precise scenario described on their website: https://rogueamoeba.com/support/knowledgebase/?showArticle=M...

thanks, yeah it looks like it uses Audio Hijack, which can "improve voice quality" but doesnt quite do the fun voice effects i wanted. thanks though! i wound up finding Voxal which maaybe does it but doesnt do the echo. and i cant see it plugging into streamdeck.