Behringer Firepower FCA610 is connected but does not provide volume

Although I'm not too familiar with this thing, I'll pass on what little i've found. You could check the firmware to see if it's the latest one here : https://www.musictribe.com/brand/c/Behringer/downloads?active=Downloads and the drivers /software as well. You may also have to go into security and privacy in system preferences, unlock it, and "allow apps from app store and identified developers", then lock it again. It should show up in Audio MIDI Setup, if not, click the gear icon to add it. I'm guessing you have the latest version of GarageBand, too. Oh this might be helpful: if you power off the FCA 610 and hold down the digital select button then power it up by either plugging in the firewire cable or the power supply (for USB) , keep holding down the button until either usb/fw lights steadily...the lights may flash, and the device may reboot itself once you let go of the digital select button. IF it's blue, then it's usb, and if it's red then it's firewire. You could try resetting smc/PMU, seeing as how you've already zapped the pram and it hasn't done a thing. It's also recommended that you turn the energy saver setting to either off or as long as possible, because when the computer goes to sleep, it messes up the MIDI and all that.I'm also guessing that you have changed the input and output sources from within Garageband (under preferences) and messed around with the smart controls, then show inspector, then choose the appropriate input. I think I'm out of ideas on this one.

sorry

John B