I've heard both 3 volt and 5 volt mic power mentioned in Edirol releases, but waiting for customer loaner to arrive soon for bench testing of this and other performance unknowns.
5 volt is also like Microtrack's 5 volt minijack. This seems good for running most small low current electrets mics like DPA 4060 series, but likely not Sonic Studios DSM if R-09 is exactly like not OK MT 5 volt.
If R-09 is 3 volt, then likely not so good for powering usual electrets and DPA, but better chance OK for DSM types with correct milli-amperage like Sharp MD and some Sony mini-DAT decks.
Hoping to do short R-09 technical review like done for Microtrack deck posted on my site.