I’m sorry, it’s not quite clear what you are asking for.
The H9000’s internal sample rate will not change and will keep the last used sample rate after a reboot unless you manually change it, or if it is synced to a clock source that changes.
The USB sample rate should not change either, but when you reboot your computer or the H9000 the “H9000 USB audio” sample rate will need to be resynced to your computer’s sample rate. This is why the toggling of the sample rate is necessary.
If you are not changing the sample rate on any of your devices and are simply rebooting your H9000 or computer, you should only need to go into the Audio/MIDI settings and toggle the “H9000 USB Audio” sample rate to fix this issue.
