Let's start by going over the stuff one piece at a time:
- what software are you using? (Win/Mac/RasPI/32/64bit/etc) and which miner (cgminer/bfgminer/etc)
- speed setting can usually be specified on the command line when you start the miner. Some of them also have options permitting you to see the current settings while everything is working. In some cases you can also change them while it's working.
- Mixing devices should be okay (even though you may still hit some USB or power or other limitations)
If for example you want to use bfgminer you could run it with the following parameters:
Awesome so i did this and got the nano fury working faster, but just went in to bfgminer 3.10 then device manager and changed the oscillator value from 50 to 52, even got it with a (relatively) low error rate, nothing like zero like i've seen though but now the whole thing has given up on me and when i try to run the nanofury i just get the line
"nfy 0: BITFURY_INIT_OLDBUF:GIVING UP AFTER 4 TRIES" but it runs that all night if i let it. ALL my other miners are doing great together on bfgminer 3.10, but i am really stuck here.