The only driver option that allows use of the R8 is the MME 32bit setting. In the ASIO setting the Playback TM has no options & the Record TM opens a long empty menu. The other driver options, when applied show the R8 & Realtek Speakers as missing.
With the MME 32bit option the 'buffers in queue' size is set to 4, the buffer size is at Fast (10.0msec 441 samples), & the effective latency at 44khz/stereo is 30.0 msec.
Also, on the Zoom R8 screen, beside the USB symbol at the top right is the number 96.0. The only option on this screen that I can change is to toggle between REC, SOLO & MUTE, but I'm not sure what these settings are for.
Thanks for your assistance David.