Is this for
UA-101?
Yes.
If so, there is no "high speed mode" on
it (AFAIK), just the dial to
change sample rate. Please see photo of the device and its controls
(
http://www.citraintirama.com/admin/product/428958Edirol%20UA- 101.jpg).
The high speed mode switch is hidden near the "Hi Speed" label:
http://cladisch.fastmail.net/ua-101-hi-speed.png
When not in high speed mode, only 44.1/48 kHz work. (See the manual.)
Oops :-) I guess when everything else fails, it is time to read the
manual...
I'll get you these later this weekend.
Best wishes,
Ico