No signal after mac sleeps

Yes, cryptic subject line, but I couldn't summarize the issue.
I'm using Logic Pro and at times I have to put the mac to sleep. On waking, Logic Pro fails to 'see' any signal, even though both Audio prefs in Logic and Sound prefs in Preferences are set to my A/D converter.
So I have to restart the mac to get it working again (and, no, repairing permissions doesn't fix the issue), which is highly inconvenient and ergonomically contentious.
Please advise.

How about just restarting coreaudio?
Open Logic Pro>Preferences>Audio>Devices>Coreaudio, change a buffer setting, change it back, now the Apply button becomes available. Click it, or simply dismiss the window. Either action will restart coreaudio within Logic, so (hopefully) no need to reboot.
BTW, the sleep function has always been iffy on Macs, the first time it ever worked for me without disrupting anything was on a Hackintosh... on Macs it often seems to screw up attached peripherals (disks, audio interfaces, MIDI controllers).

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