@HooStat I'm not sure if you saw my review (
here) but in it, I mentioned how I was using an optical to AES box for my setup and it worked without issue.
"I used these speakers both analog and digital. When using digital, I used this (relatively) $95
Hosa ODL-312 Optical SPDIF and AESEBU Digital Format Converter. This served to allow me to send my TV’s audio signal via optical output to the 8c speakers, thus enabling me to use all sources (TV, AppleTV, Blu-ray player)."
To answer your other questions:
No streaming (yet)
Volume control is indeed through the web-based app. Unless, of course, you use an external DAC with volume control.