thank you.
I somehow solved using power supply instead of the macbook cell.
With power supply engaged garageband doesn't disconnect.
It could be a USB 3.0 issue even if with Logic Pro 9 i don't have any problem at all.
I tried to install class compliant from focusrite but nothing changed. Maybe you can try to istall class compliant drivers (?) from apogee...
i wrote to focusrite engineers and they answer me (i hope this can help with apogee):
Hi Mauro,
Thanks for your email. I must admit this is not an issue I have seen before
however hopefully we can get this issue resolved for you as quickly as
possible.
I would first suggest deleting some un-needed audio related preference files
from your system; please navigate to Mac HD -> System -> Library ->
Extensions -> check to see if 'FocusriteUSB2Audio.kext' and
'NovationUSB2Audio.kext' or similar are present. If they are, please delete
them - these are unnecessary drivers.
Next, can you please go to Mac HD > Library > Preferences > Audio and
in there please delete the two preference files. If there are four files then
two of these are likely duplicates, delete these as well.
Finally, please go to Finder > click 'Go' at the top of the screen > Hold
down the "Alt" key and click on the Library folder > Preferences.
In there please trash the file "com.apple.audiomidisetup.plist".
After doing this please empty the trash, then restart your system. Do you have
the same issues after this? If so, please connect the Scarlett 2i2 to a
different USB port - does the exact same issue occur now?
Please let us know how you get on and we can take things from there.
Best Regards,
...... // Focusrite Technical Support
